Quotations about:
    doubt


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Deliberation, even about the slightest things, annoys me; and I feel my mind harder put to it to endure the various shocks and ups and downs of doubt and deliberation, than to settle down and accept any course whatever, after the die is cast. Few passions have troubled my sleep; but as for deliberations, the slightest one troubles it.

[Le deliberer, voire és choses plus legeres, m’importune. Et sens mon esprit plus empesché à souffrir le bransle, & les secousses diverses du doute, & de la consultation, qu’à se rassoir & resoudre à quelque party que ce soit, apres que la chance est livree. Peu de passions m’ont troublé le sommeil ; mais des deliberations, la moindre me le trouble.]

Michel de Montaigne (1533-1592) French essayist
Essays, Book 2, ch. 17 (2.17), “Of Presumption [De la Presomption]” (1578) [tr. Frame (1943)]
    (Source)

This essay was in the 1st (1580) edition, but this passage first showed up in the second (1588) edition.

(Source (French)). Alternate translations:

To deliberate, be it but in sleight matters, doth importune me. And I feele my spirit more perplexed to suffer the motions of doubt, and shakings of consultation, then to be settled and resolved about any accident whatsoever, after the chaunce is once cast. Fewe passions have troubled my sleep; but of deliberations the leaste doth trouble it.
[tr. Florio (1603)]

Deliberation, even in things of lightest moment, is very troublesome to me; and I find my mind more put to it, to undergo the various tumbling and tossing of doubt and consultation, than to set up its rest, and to acquiesce in whatever shall happen after the die is thrown. Few passions break my sleep; but, of deliberations, the least disturbs me.
[tr. Cotton (1686)]

Deliberation, even in things of lightest moment, is very troublesome to me; and I find my mind more put to it to undergo the various tumblings and tossings of doubt and consultation, than to set up its rest and to acquiesce in whatever shall happen after the die is thrown. Few passions break my sleep, but of deliberations, the least will do it.
[tr. Cotton/Hazlitt (1877)]

Deliberation, indeed, even in the most trivial things, importunes me; and I feel my mind more pestered in suffering the actions and diverse shocks of doubt and consultation than, after the die is cast, in settling down and resolving upon some course, whatever it may be. Few passions have ever disturbed my sleep, but the least deliberation troubles me.
[tr. Ives (1925)]

Deliberation, even in things of lightest moment, is vexatious to me; and I find my mind more put to it to bear up under the various agitations and disturbances of doubt and deliberation than in settling down and acquiescing in whatever shall happen after the die is thrown. Few passions have troubled my sleep, but of deliberations the slightest one will trouble it.
[tr. Zeitlin (1934)]

Deliberation, even in the most trivial affairs, is irksome to me; and my mind is more put about when suffering the shocks and trepidations of uncertainty and doubt than in settling down and accepting whatever happens, once the die is cast. My sleep has been broken by few passions; but the slightest suspense will break it.
[tr. Cohen (1958)]

It bothers me to make up my mind even about the most trivial things, and I feel my spirits more hard-pressed in suffering the swings of doubt and the diverse shocks of decision-making than in remaining fixed, resigned to any outcome whatsoever once the dice have been thrown. Few emotions have ever disturbed my sleep, yet even the slightest need to decide anything can disturb it for me.
[tr. Screech (1987)]
 
Added on 1-Apr-26 | Last updated 1-Apr-26
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More quotes by Montaigne, Michel de

I think that it’s an honorable thing to change your mind occasionally. I don’t think it’s a sign of weakness or lack of integrity. I believe men are united by their doubts and separated by their convictions. Therefore, it’s a very good thing to have doubts. Doubts are the greatest spur to activity that I know of.

Peter Ustinov (1921-2004) English actor, author, director
Interview (1995-06-22) by Warren Allen Smith, Free Inquiry Magazine
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Added on 23-Jan-26 | Last updated 23-Jan-26
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The instant we admit that a book is too sacred to be doubted, or even reasoned about, we are mental serfs. It is infinitely absurd to suppose that a god would address a communication to intelligent beings, and yet make it a crime, to be punished in eternal flames, for them to use their intelligence for the purpose of understanding his communication. If we have the right to use our reason, we certainly have the right to act in accordance with it, and no god can have the right to punish us for such action.

Robert Green Ingersoll (1833-1899) American lawyer, freethinker, orator
Lecture (1872-01-29), “The Gods,” Fairbury Hall, Fairbury, Illinois
    (Source)

First given on the 135th birthday of Thomas Paine. Collected in The Gods and Other Lectures (1876).
 
Added on 14-Nov-25 | Last updated 10-Nov-25
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Liberty is often a heavy burden on a man. It involves that necessity for perpetual choice which is the kind of labor men have always dreaded. In common life we shirk it by forming habits, which take the place of self-determination. In politics party-organization saves us the pains of much thinking before deciding how to cast our vote. In religious matters there are great multitudes watching us perpetually, each propagandist ready with his bundle of finalities, which having accepted we may be at peace. The more absolute the submission demanded, the stronger the temptation becomes to those who have been long tossed among doubts and conflicts.

Oliver Wendell Holmes, Sr. (1809-1894) American poet, essayist, scholar
Article (1860-09), “The Professor’s Story [Elsie Venner],” ch. 18, Atlantic Monthly, Vol. 6, No. 35
    (Source)

Originally serialized as “The Professor’s Story,” but collected as the novel Elsie Venner, ch. 18 (1861).
 
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“Lucky we know the forest so well, or we might get lost,” said Rabbit half an hour later, and he gave the careless laugh which you give when you know the Forest so well that you can’t get lost.

A. A. Milne (1882-1956) English poet and playwright [Alan Alexander Milne]
House at Pooh Corner, ch. 7 “Tigger Is Unbounced” (1928)
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Added on 10-Jun-25 | Last updated 10-Jun-25
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I once heard an orthodox person denouncing those who discuss articles of faith. “Gentlemen,” he said naïvely, “a true Christian does not examine what he is ordered to believe. Dogma is like a bitter pill: if you chew it, you will never be able to swallow it.”

[J’ai entendu un dévot, parlant contre des gens qui discutent des articles de foi, dire naïvement: «Messieurs, un vrai chrétien n’examine point ce qu’on lui ordonne de croire. Tenez, il en est de cela comme d’une pillule amère, si vous la mâchez, jamais vous ne pourrez l’avaler.»]

Nicolas Chamfort
Nicolas Chamfort (1741-1794) French writer, epigrammist (b. Nicolas-Sébastien Roch)
Products of Perfected Civilization [Produits de la Civilisation Perfectionnée], Part 2 “Characters and Anecdotes [Caractères et Anecdotes],” ¶ 1148 (1795) [tr. Hutchinson (1902)]
    (Source)

(Source (French)). Alternate translations:

I heard one day a devotee, speaking against people who discuss articles of faith, say naivement: "Gentlemen, a true Christian never examines what he is ordered to believe. It is with that as with a bitter pill; if you chew it you will never be able to swallow it."
[tr. Mathews (1878)]

I once heard a pious person say naively, in arguing with people who were discussing articles of faith, "Sirs, a true Christian does not examine what he is instructed to believe. You see, it's like a bitter pill -- if you chew it, you'll never be able to swallow it."
[tr. Dusinberre (1992), ¶1148]

A devout and naïve Christian was admonishing those who questioned the articles of faith. "A true Christian must never examine the things he's told to believe, gentlemen," he said. "It's like taking a pill: if you chew it, it's so bitter you'll never get it down."
[tr. Parmée (2003), ¶363]

 
Added on 24-Feb-25 | Last updated 21-Jul-25
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Error is boundless.
Nor hope nor doubt,
Though both be groundless,
Will average out.

j.v. cunningham
J. V. Cunningham (1911-1985) American poet, literary critic, translator, teacher [James Vincent Cunningham]
“Meditation on Statistical Method,” st. 4, The Exclusions of a Rhyme (1960)
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Added on 11-Oct-24 | Last updated 11-Oct-24
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Many teenagers are tormented by terrors they deem private and personal. They do not know that their anxieties and doubts are universal.

Haim Ginott
Haim Ginott (1922-1973) Israeli-American school teacher, child psychologist, psychotherapist [b. Haim Ginzburg]
Between Parent and Teenager, ch. 2 “Rebellion and Response” (1969)
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Added on 9-Aug-24 | Last updated 9-Aug-24
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I lay it down as a general rule, Harriet, that if a woman doubts as to whether she should accept a man or not, she certainly ought to refuse him. If she can hesitate as to ‘Yes,’ she ought to say ‘No’ directly.

Jane Austen
Jane Austen (1775-1817) English author
Emma, Vol. 1, ch. 7 [Emma] (1816)
    (Source)
 
Added on 26-Mar-24 | Last updated 26-Mar-24
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“So far,” said I, “is this from filling me,
I famish more than if I’d held my tongue,
And in my mind pile up perplexity.”

[“Io son d’esser contento più digiuno”,
diss’io, “che se mi fosse pria taciuto,
e più di dubbio ne la mente aduno.”]

Dante Alighieri the poet
Dante Alighieri (1265-1321) Italian poet
The Divine Comedy [Divina Commedia], Book 2 “Purgatorio,” Canto 15, l. 58ff (15.58-60) (1314) [tr. Sayers (1955)]
    (Source)

Dante complaining about the quality of some of Virgil's answers.

(Source (Italian)). Alternate translations:

"Oft, as I drink of that celestial rill,"
I cry'd, "I find my thirst increasing still;
Its copious draughts but more inflame my soul
In search of heav'nly truth."
[tr. Boyd (1802), st. 13]

“Now lack I satisfaction more,” said I,
“Than if thou hadst been silent at the first,
And doubt more gathers on my lab’ring thought."
[tr. Cary (1814)]

"Less satisfied am I than what I was,"
I said, "than if I still had held my peace;
And in my mind still more the doubts increase."
[tr. Bannerman (1850)]

"I am more hungering to be satisfied,"
I said, "than if I had before been silent,
And more of doubt within my mind I gather."
[tr. Longfellow (1867)]

"I am more fasting from being satisfied," said I, "than if I had before held my peace, and I unite more doubt in my mind."
[tr. Butler (1885)]

"Through being contented, I do hunger more
Than if thou first hadst silent been," I said,
"And in my mind I gather doubt galore."
[tr. Minchin (1885)]

“I am more hungering to be contented,” said I, “than if I had at first been silent, and more of doubt I assemble in my mind.
[tr. Norton (1892)]

"I am more fasting from being satisfied," said I, "than if I had kept silent at first, and more perplexity I amass in my mind."
[tr. Okey (1901)]

"I am more hungry for satisfaction" I said "than if I had been silent before and my mind is more filled with perplexity."
[tr. Sinclair (1939)]

"From being satisfied I fast not less
But more," said I, "than had I question spared,
And in my mind doubt doth the more increase."
[tr. Binyon (1943)]

"I am left hungier being thus fed,
and my mind is more in doubt being thus answered,
than if I had not asked at all," I said.
[tr. Ciardi (1961)]

"I am more hungering to be satisfied," I said, "than if I had at first been silent, and more of doubt do I assemble in my mind."
[tr. Singleton (1973)]

"I hunger more for satisfaction now,”
I said, “than when I held my tongue before,
and new perplexities come to my mind."
[tr. Musa (1981)]

"I am the more starved of satisfaction,"
I said, "than if I had said nothing just now,
And more doubt collects in my mind."
[tr. Sisson (1981)]

“I am more hungry now for satisfaction"
I said, "than if I'd held my tongue before;
I host a deeper doubt within my mind."
[tr. Mandelbaum (1982)]

“I am hungrier to be contented,” I said, “than if you had been silent earlier, and I am gathering more doubt in my mind."
[tr. Durling (2003)]

I said: "I am hungrier by being fed than if I had kept silent from the start, and I have added more confusion to my mind."
[tr. Kline (2002)]

"I hunger more for satisfaction now
than if," I said, "you'd not said anything.
I gather in my mind still greater doubt."
[tr. Kirkpatrick (2007)]

"I am more starved for answers," I said,
"'than if before I had kept silent,
since now my mind is filled with greater doubt."
[tr. Hollander/Hollander (2007)]

"My hunger for knowledge is now less satisfied,"
I said, "than if I had never asked the question,
And the more doubt collects in my troubled mind."
[tr. Raffel (2010)]

 
Added on 29-Dec-23 | Last updated 29-Dec-23
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More quotes by Dante Alighieri

I think nobody should be certain of anything. If you’re certain, you’re certainly wrong, because nothing deserves certainty, and so one ought always to hold all one’s beliefs with a certain element of doubt and one ought to be able to act vigorously in spite of the doubt.

Bertrand Russell
Bertrand Russell (1872-1970) English mathematician and philosopher
Interview by Woodrow Wyatt, BBC TV (1959)
    (Source)

Collected in Bertrand Russell's BBC Interviews (1959) [UK] and Bertrand Russell Speaks His Mind (1960) [US]. Reprinted (abridged) in The Humanist (1982-11/12), and in Russell Society News, #37 (1983-02).
 
Added on 20-Sep-23 | Last updated 20-Sep-23
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If there be any man who derides the unseen world, let him consider the death of Pentheus, and acknowledge the gods.

[εἰ δ᾽ ἔστιν ὅστις δαιμόνων ὑπερφρονεῖ,
ἐς τοῦδ᾽ ἀθρήσας θάνατον ἡγείσθω θεούς.]

Euripides (485?-406? BC) Greek tragic dramatist
Bacchæ [Βάκχαι], l. 1325ff [Cadmus/κάδμος] (405 BC) [tr. Vellacott (1973)]
    (Source)

(Source (Greek)). Alternate translations:

If any impious mortal yet contemns
The Powers celestial, let him view the death
Of Pentheus, to convince him there are Gods.
[tr. Wodhull (1809)]

If anyone scorns the gods, let him look to the death of this man and acknowledge them.
[tr. Buckley (1850)]

O if there be he who scorneth the great gods,
Gaze on this death, and know that there are gods.
[tr. Milman (1865)]

If there be one who still disdains the gods,
Let him behold this corpse and reverence them.
[tr. Rogers (1872), l. 1293ff]

Ah! if there be any man that scorns the gods, let him well mark this prince’s death and then believe in them.
[tr. Coleridge (1891)]

If any man there be that scorns the Gods,
This man's death let him note, and so believe.
[tr. Way (1898)]

Oh, whoso walketh not in dread
Of Gods, let him but look on this man dead!
[tr. Murray (1902)]

If there is still any mortal man
who despises or defies the gods, let him look
on this boy's death and believe in the gods.
[tr. Arrowsmith (1960)]

If there is any man who despises deity
let him look on Pentheus’ death, and judge that gods exist!
[tr. Kirk (1970)]

If any man thinks light of the divine ones,
let him consider this man’s death, and believe in gods.
[tr. Neuburg (1988)]

If there be any man who challenges or scorns
the unseen powers,
let him look on this boy's death and accept
that which is God.
[tr. Cacoyannis (1982)]

If there is anyone who despises the gods,
Looking on this death, let him believe.
[tr. Blessington (1993)]

So if there is anyone who disdains the gods
let him look at the death of this man here and let him believe that gods exist.
[tr. Esposito (1998)]

If there is anyone who despises the divine,
he should look at this man's death and believe in gods.
[tr. Woodruff (1999)]

Anyone who feels
Superior to the gods should study this:
Pentheus is dead -- believe in the gods!
[tr. Gibbons/Segal (2000)]

If there is anyone who thinks nothing of heaven's power, let him look at this man's death and believe that the gods exist.
[tr. Kovacs (2002)]

Let he who would defy the gods’ demands
Look at this piteous death and believe.
[tr. Teevan (2002)]

If there’s anyone who insults the gods let him turn his eyes to this and let him believe.
[tr. Theodoridis (2005)]

If there is anyone here who casts a disparaging eye
Upon the Divine, look now on this and know the Gods exist.
[tr. Valerie (2005)]

If there's a man who disrespects the gods,
let him think about how this man perished --
then he should develop faith in them.
[tr. Johnston (2008)]

If anyone still disputes the power of heaven,
let them look at this boy's death
and they will see that the gods live.
[tr. Robertson (2014)]

If there are any left who would look down on the gods, let them see this.
This death.
And let them know the gods.
[tr. Pauly (2019)]

If anyone, anywhere, denies the gods,
seeing this death, let him belisve in them.
[tr. Behr/Foster (2019)]

If anyone scorns the daimones, let him look to the death of this man and acknowledge them.
[tr. Buckley/Sens/Nagy (2020)]

 
Added on 11-Jul-23 | Last updated 11-Jul-23
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More quotes by Euripides

He who stifles free discussion, secretly doubts whether what he professes to believe is really true.

Wendell Phillips (1811-1884) American abolitionist, orator, social activist
Speech, Daniel O’Connell celebration, Boston (1870-08-06)
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Added on 5-Jul-23 | Last updated 5-Jul-23
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I hav lived in this world jist long enuff tew look karefully the seckond time into things that i am the most certain ov the fust time.

[I have lived in this world just long enough to look carefully the second time into things that I am the most certain of the first time.]

Josh Billings (1818-1885) American humorist, aphorist [pseud. of Henry Wheeler Shaw]
Everybody’s Friend, Or; Josh Billing’s Encyclopedia and Proverbial Philosophy of Wit and Humor, ch. 152 “Affurisms: Chicken Feed” (1874)
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Added on 8-Jun-23 | Last updated 18-Jan-24
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You believe someone not because you have no doubts about them. Belief is not the absence of doubt. You believe someone because you don’t have enough doubts about them.

Malcolm Gladwell
Malcolm Gladwell (b. 1963) Anglo-Canadian journalist, author, public speaker
Talking to Strangers: What We Should Know About the People We Don’t Know (2019)
    (Source)
 
Added on 22-May-23 | Last updated 22-May-23
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You are the sun who heals all clouded sight.
Solving my doubts, you bring me such content
That doubt, no less than knowing, is delight.

[O sol che sani ogne vista turbata,
tu mi contenti sì quando tu solvi,
che, non men che saver, dubbiar m’aggrata.]

Dante Alighieri the poet
Dante Alighieri (1265-1321) Italian poet
The Divine Comedy [Divina Commedia], Book 1 “Inferno,” Canto 11, l. 91ff (11.91-93) [Dante] (1309) [tr. Kirkpatrick (2006)]
    (Source)

Flattering Virgil before he asks another question. (Source (Italian)). Alternate translations:

O you, who like the Sun each weaken'd sight
Relieve, and give such pleasure when you clear
My doubts, that I to raise them oft desire.
[tr. Rogers (1782), l. 89ff]

Can I repent my doubts! illumin'd Bard,
When thus thy heav'nly words my doubts reward?
[tr. Boyd (1802), st. 14]

O Sun! who healest all imperfect sight,
Thou so content’st me, when thou solv’st my doubt,
That ignorance not less than knowledge charms.
[tr. Cary (1814)]

O Sun, that healest every troubled sight!
So full content, thou solving, doth ensue,
Glads me no less to doubt, than judge aright.
[tr. Dayman (1843)]

O Sun! who healest all troubled vision, thou makest so glad when thou resolvest me, that to doubt is not less grateful than to know.
[tr. Carlyle (1849)]

Thou sun, that clearest every clouded sight,
You so content me to dissolve the knot,
To know is scarce so pleasing as to doubt.
[tr. Bannerman (1850)]

Oh, sun! thou healer of the troubled sight,
What thou declarest makes me so content,
That as in knowledge I rejoice in doubt.
[tr. Johnston (1867)]

O Sun, that healest all distempered vision,
Thou dost content me so, when thou resolvest,
That doubting pleases me no less than knowing!
[tr. Longfellow (1867)]

O Sun that healest every troubled sight, so dost thou content me when thou solvest, that doubting gives me no less pleasure than knowing.
[tr. Butler (1885)]

O Sun, that healest every troubled sight.
Thou so contentest me when thou mak'st clear
Doubts, that no less than knowledge they delight.
[tr. Minchin (1885)]

O Sun that healest every troubled vision, thou dost content me so, when thou explainest, that doubt, not less than knowledge, pleaseth me.
[tr. Norton (1892)]

O sun, that bringest healing unto all clouded vision, thou grantest unto me such satisfaction in thine unravelling, that doubting doth delight me.
[tr. Sullivan (1893)]

Oh! sun, who makest whole all troubled vision.
Thou dost content me so when thou resolvest
That doubt is joy to me, no less than knowledge.
[tr. Griffith (1908)]

O Sun that healest all troubled sight, so dost thou satisfy me with the resolving of my doubts that it is no less grateful to me to question than to know.
[tr. Sinclair (1939)]

O Sun, who heal'st all troubled vision, and so
Contentest me where thou doest certify,
That to doubt pleaseth not less than to know ....
[tr. Binyon (1943)]

O Sun that healest all dim sight, thou so
Doest charm me in resolving of my doubt,
To be perplexed is pleasant as to know.
[tr. Sayers (1949)]

O sun which clears all mists from troubled sight,
such joy attends your rising that I feel
as grateful to the dark as to the light.
[tr. Ciardi (1954)]

O sun that heal every troubled vision, you do content me so, when you solve, that questioning, no less than knowing, pleases me.
[tr. Singleton (1970)]

O sun that shines to clear a misty vision,
such joy is mine when you resolve my doubts
that doubting pleases me no less than knowing!
[tr. Musa (1971)]

O sun that heals all sight that is perplexed,
when I ask you, your answer so contents
that doubting pleases me as much as knowing.
[tr. Mandelbaum (1980)]

O sun who clears every obscure perception
You give such satisfaction when you enlighten me
That, not less than knowledge, doubt is agreeable.
[tr. Sisson (1981)]

O sun, that makes all troubled vision clear,
You give solutions I am so contented with
That asking, no less than knowing, pleases me.
[tr. Pinsky (1994), l. 87ff]

O sun that heals every clouded sight, you content me so when you resolve questions, that doubting is no less pleasurable than knowing.
[tr. Durling (1996)]

O Sun, that heals all troubled sight, you make me so content when you explain to me, that to question is as delightful as to know.
[tr. Kline (2002)]

O sun, you who heal all troubled sight,
you so content me by resolving doubts
it pleases me no less to question than to know.
[tr. Hollander/Hollander (2007)]

O shining sun, healer of troubled vision,
I'm satisfied so well, my mind so settled,
That knowledge pleases me no more than asking questions!
[tr. Raffel (2010)]

"Bright sun," I said, you calm these doubts of mine
As you heal any troubled sight. Such ease
You bring me that to question pleases me
Like being answered."
[tr. James (2013)]

 
Added on 24-Mar-23 | Last updated 22-Mar-24
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More quotes by Dante Alighieri

If I valued fame, I should flatter received opinions, which have gathered strength by time, and will yet wear longer than any living works to the contrary. But, for the soul of me, I cannot and will not give the lie to my own thoughts and doubts, come what may. If I am fool, it is, at least, a doubting one; and I envy no one the certainty of his self-approved wisdom.

Lord Byron
George Gordon, Lord Byron (1788-1824) English poet
Journal (1813-11-27)
    (Source)
 
Added on 16-Mar-23 | Last updated 27-Mar-23
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It was one of the rules which above all others made Doctr. Franklin the most amiable of men in society, “never to contradict any body.” if he was urged to announce an opinion, he did it rather by asking questions, as if for information, or by suggesting doubts.

Thomas Jefferson (1743-1826) American political philosopher, polymath, statesman, US President (1801-09)
Letter (1808-11-24) to Thomas Jefferson Randolph
    (Source)

Referring to Benjamin Franklin.
 
Added on 31-Oct-22 | Last updated 25-Feb-25
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Our secularism is hard-won, the product of centuries of political, intellectual, and sometimes physical courage. Secularism is the institutionalization of doubt, or more precisely of respect for doubt. It is harder to love doubt than to love freedom. So we are grudging about our secularism, and some of us are a little ashamed of it. Maybe it takes Rushdie’s nightmare and Khomeini’s rage to remind us how precious it is, and how fiercely it must be guarded.

Hendrik Hertzberg (b. 1943) American journalist, editor, speech writer, political commentator
“TRB from Washington,” The New Republic (20 Mar 1989)
    (Source)
 
Added on 25-Feb-22 | Last updated 25-Feb-22
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BECKET: Beauty is one of the few things which don’t shake one’s faith in God.

[Le beauté est une des rares choses qui ne font pas douter de Dieu.]

Jean Anouilh (1910-1987) French dramatist
Becket, Act 1 (1959) [tr. Hill (1960)]
    (Source)

The official English translation approved by Anouilh. (Source (French)). Alternate translations:

Beauty is one of the very few things that don't shake one's faith in God.
[tr. Raphael and Raphael (2004)]

Beauty is one of the rare things that do not lead to doubt of God.
[Frequently found translation, but source unknown]

 
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Once you become self-conscious, there is no end to it; once you start to doubt, there is no room for anything else.

Mignon McLaughlin (1913-1983) American journalist and author
The Neurotic’s Notebook, ch. 5 (1963)
    (Source)
 
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I felt fairly sure that the Almighty, whatever name tag He had on at the moment, could handle a few questions from people sincerely looking for answers. Hell, He might even like it.

Jim Butcher (b. 1971) American author
Changes, ch. 14 (2010)
    (Source)
 
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Inquiry into the evidence of a doctrine is not to be made once for all, and then taken as finally settled. It is never lawful to stifle a doubt; for either it can be honestly answered by means of the inquiry already made, or else it proves that the inquiry was not complete.

“But,” says one, “I am a busy man; I have no time for the long course of study which would be necessary to make me in any degree a competent judge of certain questions, or even able to understand the nature of the arguments.” Then he should have no time to believe.

William Kingdon Clifford (1845-1879) English mathematician and philosopher
“The Ethics of Belief,” Part 1 “The Duty of Inquiry,” Lecture, London (11 Apr 1876)
    (Source)
 
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Every time we let ourselves believe for unworthy reasons, we weaken our powers of self-control, of doubting, of judicially and fairly weighing evidence. We all suffer severely enough from the maintenance and support of false beliefs and the fatally wrong actions which they lead to, and the evil born when one such belief is entertained is great and wide. But a greater and wider evil arises when the credulous character is maintained and supported, when a habit of believing for unworthy reasons is fostered and made permanent.

William Kingdon Clifford (1845-1879) English mathematician and philosopher
“The Ethics of Belief,” Part 1 “The Duty of Inquiry,” Lecture, London (11 Apr 1876)
    (Source)
 
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To know all about anything is to know how to deal with it under all circumstances. We feel much happier and more secure when we think we know precisely what to do, no matter what happens, than when we have lost our way and do not know where to turn. And if we have supposed ourselves to know all about anything, and to be capable of doing what is fit in regard to it, we naturally do not like to find that we are really ignorant and powerless, that we have to begin again at the beginning, and try to learn what the thing is and how it is to be dealt with — if indeed anything can be learnt about it. It is the sense of power attached to a sense of knowledge that makes men desirous of believing, and afraid of doubting.

William Kingdon Clifford (1845-1879) English mathematician and philosopher
“The Ethics of Belief,” Part 1 “The Duty of Inquiry,” Lecture, London (11 Apr 1876)
    (Source)
 
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Knowledge breeds doubt, not certainty, and the more we know the more uncertain we become.

Taylor - Knowledge breeds doubt, not certainty - wist.info quote

A. J. P. Taylor (1906-1990) British historian, journalist, broadcaster [Alan John Percivale Taylor]
“What Else Indeed?” New York Review of Books (5 Aug 1965)
    (Source)
 
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Doubts are not the enemy of belief, they are its companion.

Malcolm Gladwell
Malcolm Gladwell (b. 1963) Anglo-Canadian journalist, author, public speaker
Talking to Strangers (2019)
    (Source)
 
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The worst part of fear is not knowing what to do. And often you have only to ask What would I do if I were not afraid? to know what to do, and do it, and not be afraid.

James Richardson (b. 1950) American poet
Vectors: Aphorisms and Ten-Second Essays, #121 (2001)
    (Source)
 
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And the funny thing was that people who weren’t entirely certain they were right always argued much louder than other people, as if the main person they were trying to convince were themselves.

Terry Pratchett (1948-2015) English author
Bromeliad No. 2, Diggers, ch. 4 (1990)
    (Source)
 
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I hate doubt, yet I am certain that doubt is the only way to approach anything worth believing in.

Edward Teller (1908-2003) Hungarian-American theoretical physicist
In Phillip Berman, The Courage of Conviction (1985)
    (Source)
 
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To ridicule philosophy, that is really to act the philosopher.

[Se moquer de la philosophie c’est vraiment philosophe.]

Blaise Pascal (1623-1662) French scientist and philosopher
Thoughts [Pensées], Article 7, #35 (1670)

Pascal's works are sorted and classified by translators in a variety of ways, so numbering is inconsistent. Alternate translations:
  • "To have no time for philosophy is to be a true philosopher." [tr. Krailsheimer (2003); Series 22, #513]
  • "To make light of philosophy is to be a true philosopher." [tr. Paul (1885), "Various Thoughts"; also Trotter (1958), Sec. 1, #4]
  • "To ridicule philosophy is really to philosophize." [#430]
  • "To ridicule philosophy is truly philosophical."
  • "To mock philosophy is to philosophize truly"
  • "To mock philosophy is to be a true philosopher."
 
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You must have three essentials for the investigation of Chan [Zen]. The first is that you must have the foundation of great faith. The second is that you must have a zealous determination. The third is that you must have the feeling of great doubt. If you omit one of these it is like breaking off the leg of a tripod, which ends up becoming a useless vessel.

高峰云、叅禪須具三要 一有大信根
二有大憤志 三有大疑情 苟闕其一
如折足之鼎 終成廢器。

Hyujeong (1520-1604) Korean Seon (Sŏn, Zen) Master [Sosan Taesa, Seosan Daesa, Dae Seonsa]
Mirror of Zen [Samga Gwigam; Samga Kwigom; Seonga Gwigam], ch. 14 [tr. Jorgensen (2012)]
    (Source)

Alternate translations:

For the study of Seon, there are three requirements: (1) having the great root of faith; (2) having great determination, and (3) having great doubt. If you lack one of these, it is like a broken like on a tripod sacrificial vessel. In the end you will discard it.
[tr. Miller (2017)]

There are three essentials to Sŏn meditation. First of all, you must be rooted in Great Faith and Great Confidence. Secondly, one must have Great Anger -- a strong, inwardly-directed, ardent determination to practice. Thirdly, one must have Great Doubt. If one of these is missing, it is like a tripod vessel with one leg cut off -- in the end, it will be of no use.
[Source]

It is well known that Ganhwaseon practitioners must have three things of essential importance: The first is a Foundation of Great Faith (大信根) for the practice which is possible; the second is Great Zealous Determination (大憤志) of practice to attain enlightenment; the third is a Great Feeling of Doubt (大疑情) on the Hwadu. If one of these is lacking, then it is like a tripod pot with a broken foot and is useless.
[Source]

 
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If you tried to doubt everything you would not get as far as doubting anything. The game of doubting itself presupposes certainty.

Ludwig Wittgenstein (1889-1951) Austrian-English philosopher
On Certainty, Para. 115 (1969) [tr. Paul & Anscombe]
 
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The path of sound credence is through the thick forest of skepticism.

George Jean Nathan (1892-1958) American editor and critic
Materia Critica, “Critic and Criticism,” sec. 4 (1924)
    (Source)
 
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ONLY THE MADMAN IS ABSOLUTELY SURE.

Robert Anton Wilson (1932-2007) American author, futurist self-described "agnostic mystic" [pen name of Robert Edward Wilson]
The Eye in the Pyramid (1975) [with Robert Shea]
    (Source)
 
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It would never come into their [the masses’] heads to fabricate colossal untruths, and they would not believe that others could have the impudence to distort the truth so infamously. Even though the facts which prove this to be so may be brought clearly to their minds, they will still doubt and waver and will continue to think that there may be some other explanation. For the grossly impudent lie always leaves traces behind it, even after it has been nailed down, a fact which is known to all expert liars in this world and to all who conspire together in the art of lying.

Adolph Hitler (1889-1945) German leader
Mein Kampf [My Struggle], Vol. 1, ch. 10 (1925)
 
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The total moral collapse of respectable society during the Hitler regime may teach us that under such circumstances those who cherish values and hold fast to moral norms and standards are not reliable: we now know that moral norms and standards can be changed overnight, and that all that then will be left is the mere habit of holding fast to something.
Much more reliable will be the doubters and skeptics, not because skepticism is good or doubting wholesome, but because they are used to examine things and to make up their own minds.
Best of all will be those who know only one thing for certain: that whatever else happens, as long as we live we shall have to live together with ourselves.

Hannah Arendt (1906-1975) German-American philosopher, political theorist
Essay (1964-08), “Personal Responsibility Under Dictatorship,” The Listener Magazine
    (Source)

Collected in Responsibility and Judgment, Part 1 "Responsibility" (2003).
 
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ALCESTE: This is a subject on which, no matter what is learned, doubts are more cruel than the worst of truths.

[Mais sur ce sujet quoi que l’on nous expose,
Les doutes sont fâcheux plus que toute autre chose.]

Molière (1622-1673) French playwright, actor [stage name for Jean-Baptiste Poquelin]
Le Misanthrope, Act 3, sc. 7 (1666) [tr. Wormeley (1894)]
    (Source)

On being told by Arsinoé that he is betrayed by Célimène.

(Source (French)). Alternate translations:

But whatever may be openly said on this subject is not half so annoying as hints thrown out.
[tr. Van Laun (1878), 3.7]

But on this subject, whatever we may be told, doubts are of all things the most tormenting.
[tr. Mathew (1890) 3.4]

But whatever we may be told on this subject is not half so disturbing as hints and innuendoes.
[tr. Waller (1903), 3.5]

In such a case, whatever we may learn,
Doubts are more torturing than any truth.
[tr. Page (1913), 3.7]

Madam, you know that doubt and vague suspicion
Are painful to a man in my position.
[tr. Wilbur (1954), 3.7]

No matter what one says on such a theme,
It's doubt which is the most distressing thing.
[tr. Bishop (1957)]

Whatever we are told in this domain,
Doubt is the thing that gives the greatest pain.
[tr. Frame (1967), 3.5]

 
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When we are tired, we are attacked by ideas we conquered long ago.

Friedrich Nietzsche (1844-1900) German philosopher and poet
(Attributed)

Frequently attributed to Nietzsche, starting in the late 1950s, but never cited and not found in any of his writings. More discussion here.
 
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Men become civilized not in proportion to their willingness to believe but in proportion to their readiness to doubt.

H. L. Mencken (1880-1956) American writer and journalist [Henry Lewis Mencken]
“What I Believe,” sec. 4, Forum and Century (Sep 1930)
    (Source)
 
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The seed had sprouted into that most wonderful and horrible of fruits: doubt, which, like the strawberry, has a succulent taste, but has also a tendency to spread and spread, until it dominates whatever garden it has taken root in.

Steven Brust (b. 1955) American writer, systems programmer
The Phoenix Guards (1991)
 
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HAMLET: Doubt thou the stars are fire;
Doubt that the sun doth move;
Doubt truth to be a liar;
But never doubt I love.

Shakespeare - never doubt I love - wist_info quote

Shakespeare
William Shakespeare (1564-1616) English dramatist and poet
Hamlet, Act 2, sc. 2, l. 124ff (2.2.124-127) (c. 1600)
    (Source)

A letter from Hamlet to Ophelia, read by Polonius.
 
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The world is made up for the most part of morons and natural tyrants, sure of themselves, strong in their own opinions, never doubting anything.

Clarence Darrow (1857-1938) American lawyer
Personal Liberty (1928)
 
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If you don’t have confidence, you’ll always find a way not to win.

Lewis - confidence - wist_info quote

Carl Lewis (b. 1961) American Olympic athlete
(Attributed)
 
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If I want to stop a research program I can always do it by getting a few experts to sit in on the subject, because they know right away that it was a fool thing to try in the first place.

Charles F. Kettering (1876-1958) American inventor, engineer, researcher, businessman
(Attributed)
 
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The trouble about God is that he is like a person who never acknowledges one’s letters and so, in time, one comes to the conclusion either that he does not exist or that you have got the address wrong. I admitted that it was of great moment: but what was the use of going on dispatching fervent messages — say to Edinburgh — if they all came back through the dead letter office: nay more, if you couldn’t even find Edinburgh on the map.

C. S. Lewis (1898-1963) English writer, literary scholar, lay theologian [Clive Staples Lewis]
Letter to Warren Lewis (1 Jul 1921)
 
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The only limit to our realization of tomorrow will be our doubts of today.

Franklin Delano Roosevelt (1882–1945) American lawyer, politician, statesman, US President (1933–1945)
Speech (1945-04-13), Jefferson Day (undelivered)
    (Source)

Roosevelt died the day before this speech was to be delivered by radio.
 
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The presence of those seeking the truth is infinitely to be preferred to the presence of those who think they’ve found it.

Terry Pratchett (1948-2015) English author
Discworld No. 31, Monstrous Regiment (2003)
    (Source)
 
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If you can trust yourself when all men doubt you,
But make allowance for their doubting, too ….

Rudyard Kipling (1865-1936) English writer
“If–” st. 1 (1910)
    (Source)
 
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The great leaders of the people of God, like Moses, have always left room for doubt. You must leave room for the Lord, not for our certainties; we must be humble. Uncertainty is in every true discernment that is open to finding confirmation in spiritual consolation.

Francis I (1936-2025) Argentinian Catholic Pope (2013–2025) [b. Jorge Mario Bergoglio]
Interview with Antonio Spadaro, America Magazine (30 Sep 2013)
    (Source)
 
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If you can’t stop the bad thoughts from coming to visit, at least you can make fun of them while they’re hanging around.

Jim Butcher (b. 1971) American author
Turn Coat, ch. 14 (2009)
    (Source)
 
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Skepticism is the beginning of faith.

Oscar Wilde (1854-1900) Irish poet, wit, dramatist
The Picture of Dorian Gray, ch. 17 (1891)

See also Emerson, Hesse, Tennyson.
 
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Where men are the most sure and arrogant, they are commonly the most mistaken, and have there given reins to passion, without that proper deliberation and suspense, which can alone secure them from the grossest absurdities.

David Hume (1711-1776) Scottish philosopher, economist, historian, empiricist
An Enquiry Concerning the Principles of Morals, Sec. 9.13 “Conclusion, Pt. 1” (1751)
 
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Not that indeed I imitated the sceptics, who only doubt for the sake of doubting, and pretend to be always uncertain; for, on the contrary, my design was only to provide myself with good ground for assurance, and to reject the quicksand and mud in order to find the rock or clay.

[Non que j’imitasse pour cela les sceptiques, qui ne doutent que pour douter, et affectent d’être toujours irrésolus; car, au contraire, tout mon dessein ne tendoit qu’à m’assurer, et à rejeter la terre mouvante et le sable pour trouver le roc ou l’argile.]

René Descartes (1596-1650) French philosopher, mathematician
Discourse on Method [Discours de la méthode], Part 3 (1637) [tr. Haldane & Ross (1911)]
    (Source)

(Source (French)). Alternate translations:

Not that I therein imitated the Scepticks, who doubt onely to the end they may doubt, and affect to be always unresolved: For on the contrary, all my designe tended onely to fix my self, and to avoid quick-mires and sands, that I might finde rock and clay.
[tr. Newcombe ed. (1649)]

Not that in this I imitated the sceptics who doubt only that they may doubt, and seek nothing beyond uncertainty itself; for, on the contrary, my design was singly to find ground of assurance, and cast aside the loose earth and sand, that I might reach the rock or the clay.
[tr. Veitch (1901)]

For all that, I did not imitate the sceptics who doubt only for doubting's sake, and pretend to be always undecided; on the contrary, my whole intention was to arrive at a certainty, and to dig away the drift and the sand until I reached the rock or the clay beneath.
[tr. Huxley (1870)]

In doing this I was not copying the sceptics, who doubt only for the sake of doubting and pretend to be always undecided; on the contrary, my whole aim was to reach certainty -- to cast aside the loose earth and sand so as to come upon rock or clay.
[tr. Cottingham, Stoothoff (1985)]

 
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When in Doubt, win the Trick.

edmond hoyle
Edmond Hoyle (1672-1769) Writer, esp. of card game rules and play.
“Mr. Hoyle’s Game at Whist: Twenty-Four Short Rules for Learners,” No. 12, Hoyle’s Games Improved (1790 ed.) [ed. Charles Jones]
    (Source)

While Hoyle (and even the Hoyle Improved) date back decades earlier, this was the first edition that included this Beginner’s Tip for Whist.
 
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To spell out the obvious is often to call it into question.

Eric Hoffer (1902-1983) American writer, philosopher, longshoreman
Passionate State of Mind, Aphorism 220 (1955)
    (Source)
 
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Doubt is to certainty as neurosis is to psychosis. The neurotic is in doubt and has fears about persons and things; the psychotic has convictions and makes claims about them. In short, the neurotic has problems, the psychotic has solutions.

Thomas Szasz (1920-2012) Hungarian-American psychiatrist, educator
“Mental Illness,” The Second Sin (1973)
    (Source)
 
Added on 27-Oct-11 | Last updated 13-Jun-24
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What do I believe? I believe in God, if he exists.

Stanislaw Lec (1909-1966) Polish aphorist, poet, satirist
Unkempt Thoughts [Myśli nieuczesane] (1957) [tr. Gałązka (1962)]
 
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The uncompromising attitude is more indicative of an inner uncertainty than of deep conviction. The implacable stand is directed more against the doubt within than the assailant without.

Eric Hoffer (1902-1983) American writer, philosopher, longshoreman
Passionate State of Mind, Aphorism 63 (1955)
    (Source)
 
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Progress generally begins in skepticism about accepted truths. Intellectual freedom means the right to reexamine much that has been long taken for granted. A free man must be a reasoning man, and he must dare to doubt what a legislative or electoral majority may most passionately assert. The danger that citizens will think wrongly is serious, but less dangerous than atrophy from not thinking at all.

Robert H. Jackson (1892-1954) US Supreme Court Justice (1941-54), lawyer, jurist, politician
American Communications Assn. v. Douds, 339 U.S. 382, 442 (1950) [concurrence and dissent]
    (Source)
 
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I will not attack your doctrines nor your creeds if they accord liberty to me. If they hold thought to be dangerous — if they aver that doubt is a crime, then I attack them one and all, because they enslave the minds of men.

Robert Green Ingersoll (1833-1899) American lawyer, freethinker, orator
“The Ghosts” (1877)
    (Source)
 
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Isn’t it the moment of most profound doubt that gives birth to new certainties? Perhaps hopelessness is the very soil that nourished human hope; perhaps one could never find sense in life without first experiencing its absurdity.

Václav Havel (1936-2011) Czech playwright, essayist, dissident, politician
Speech, Salzburg Festival (26 Jul 1990)
    (Source)
 
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Moral certainty is always a sign of cultural inferiority. The more uncivilized a man, the surer he is that he knows precisely what is right and what is wrong. All human progress, even in morals, has been the work of men who have doubted the current moral values, not of men who have whooped them up and tried to enforce them. The truly civilized man is always skeptical and tolerant in this field as in all others. His culture is based on “I am not too sure.”

H. L. Mencken (1880-1956) American writer and journalist [Henry Lewis Mencken]
Minority Report : H.L. Mencken’s Notebooks, #418 (1956)
    (Source)
 
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To doubt one’s own first principles is the mark of a civilized man. Don’t defend past actions; what is right today may be wrong tomorrow. Don’t be consistent; consistency is the refuge of fools.

Hyman Rickover (1900-1986) Polish-American naval engineer, admiral [b. Chaim Gdala Rykower]
Speech (1954-03-16), “Administering a Large Military Development Project,” US Naval Postgraduate School, Monterey, California
    (Source)
 
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If fallacies come knocking at my door,
I’d rather feed, and shelter full a score,
Than hide behind the black portcullis, doubt,
And run the risk of barring one Truth out.

And if pretension for a time deceive,
And prove me one too ready to believe,
Far less my shame, than if by stubborn act,
I brand as lie, some great colossal Fact.

Ella Wheeler Wilcox (1850-1919) American author, poet, temperance advocate, spiritualist
Poem (1906), “‘Credulity,'” st. 1-2, New Thought Pastels
    (Source)
 
Added on 15-Jan-08 | Last updated 5-Feb-25
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In my religion there would be no exclusive doctrine; all would be love, poetry and doubt.

Cyril Connolly (1903-1974) English intellectual, literary critic and writer.
The Unquiet Grave (1945)
 
Added on 11-Dec-07 | Last updated 17-Jul-20
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Life is made up of a series of judgments on insufficient data, and if we waited to run down all our doubts, it would flow past us.

Learned Hand (1872-1961) American jurist
“On Receiving an Honorary Degree,” speech, Harvard University (1939-01-22)
    (Source)

First printed in the Harvard Alumni Bulletin (7 Jul 1939)
 
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Sufficient to today are the duties of today. Don’t waste life in doubts and fears; spend yourself on the work before you, well assured that the right performance of this hour’s duties will be the best preparation for the hours and ages that will follow it.

Ralph Waldo Emerson
Ralph Waldo Emerson (1803-1882) American essayist, lecturer, poet
“Immortality,” Letters and Social Aims (1876)
    (Source)
 
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We know accurately only when we know little, with knowledge doubt increases.

[Eigentlich weiss man nur wenn man wenig weiss; mit dem Wissen wachst des Zweifel.]

Johann Wolfgang von Goethe (1749-1832) German poet, statesman, scientist
Spruche in Prosa [Proverbs in Prose] (1819)
 
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LUCIO: Our doubts are traitors
And make us lose the good we oft might win,
By fearing to attempt.

Shakespeare
William Shakespeare (1564-1616) English dramatist and poet
Measure for Measure, Act 1, sc. 4, l. 85ff (1.4.85-87) (1604)
    (Source)
 
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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

[Veritatem inquirenti, semel in vita de omnibus, quantum fieri potest, esse dubitandum.]

Descartes - If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things - wist.info quote

René Descartes (1596-1650) French philosopher, mathematician
Principles of Philosophy [Principia Philosophiae], Part 1 “The Principles of Human Knowledge [De Principiis Cognitionis Humane],” Article 1 (1644)

Common, unsourced translation of Descartes first principle. Frequently mis-sourced to Discourse on Method (1637) or Meditations on First Philosophy (1641), though those predecessor works do speak of the same principle.

(Source (Latin)). Alternate translations:

That in order to seek truth, it is necessary once in the course of our life, to doubt, as far as possible, of all things.
[tr. Veitch (1850)]

That in order to examine into the truth, it is necessary once on one's life to doubt of all things, so far as this is possible.
[tr. Haldane/Ross (1934)]

The seeker after truth must, once in the course of his life, doubt everything, as far as possible.
[tr. Miller & Miller (1982)]

That whoever is searching after truth must, once in his life, doubt all things; insofar as this is possible.
[tr. Cottingham/Stoothoff/Murdoch (1985)]

 
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Doubt is the vestibule through which all must pass before they can enter into the temple of wisdom.

Charles Caleb "C. C." Colton (1780-1832) English cleric, writer, aphorist
Lacon: Or, Many Things in Few Words, Vol. 1, § 251 (1820)
    (Source)
 
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If a man will begin with certainties, he shall end in doubts; but if he will be content to begin in doubts, he shall end in certainties.

Francis Bacon (1561-1626) English philosopher, scientist, author, statesman
De Augmentis Scientiarum [Advancement of Learning], Book 1, ch. 5, sec. 8 (1605)

Alt trans. (Willey Book ed., (1944)): "If we begin with certainties, we shall end in doubts; but if we begin with doubts, and are patient with them, we shall end in certainties."
 
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Inquiry is fatal to certainty.

William James (Will) Durant (1885-1981) American historian, teacher, philosopher
The Age of Faith, ch. 38 “The Age of Romance” (1950)
    (Source)
 
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Who never doubted never half believed
Where doubt there truth is — ’tis her shadow

Phillip James Bailey
Philip James Bailey (1816-1902) English poet, lawyer
Festus, Sc. “A Country Town – Market-place – Noon” [Lucifer] (1839)
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In my opinion, any faith that cannot withstand a little shaking isn’t constructed too well to begin with. Jesus built his church on a rock, not on swampland.

No picture available
John Russell (contemp.) ("jr")
Belief-L
 
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The fatal tendency of mankind to leave off thinking about a thing when it is no longer doubtful is the cause of half their errors.

John Stuart Mill (1806-1873) English philosopher and economist
On Liberty, ch. 2 “Of the Liberty of Thought and Discussion” (1859)
    (Source)
 
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HECTOR: Modest doubt is called
The beacon of the wise.

Shakespeare
William Shakespeare (1564-1616) English dramatist and poet
Troilus and Cressida, Act 2, sc. 2, l. 15ff (2,2,15-16) (1602)
    (Source)
 
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Freedom of speech and freedom of action are meaningless without freedom to think. And there is no freedom of thought without doubt.

Bergen Evans (1904-1978) American educator, writer, lexicographer
The Natural History of Nonsense, ch. 19 (1946)
 
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By doubting we come at truth.

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher
(Attributed)

Widely attributed, but no citation found.
 
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Those who believe that they believe in God, but without passion in their hearts, without anguish in mind, without uncertainty, without doubt, without an element of despair even in their consolation, believe only in the God idea, not in God Himself.

[Los que sin pasión de ánimo, sin congoja, sin incertidumbre, sin duda, sin la desesperación en el consuelo, creen creer en Dios, no creen sino en la idea de Dios, más no en Dios mismo.]

Miguel de Unamuno (1864-1936) Spanish philosopher and writer [Miguel de Unamuno y Jugo]
The Tragic Sense of Life [Del sentimiento trágico de la vida], ch. 9 “Faith, Hope, and Charity” (1912) [tr. Flitch (1921)]
    (Source)

Alt. trans. [tr. Kerrigan (1972)]: "Whoever believes he believes in God, but believes without passion, without anguish, without uncertainty, without doubt, without despair-in-consolation, believes only in the God-Idea, not in God Himself."

Original Spanish.

In Unamuno's earlier, unpublished work Treatise on the Love of God [Tratado del amor de Dios], ch. 3 "What is Faith?" (1905-08) [tr. Orringer], he used this same phrase and surrounding text: "Those without passion in their soul, without anguish, without uncertainty, without doubt, without despair in consolation, think they believe in God; they believe only in the idea of God, but not in God Himself."
 
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Shake off all the fears and servile prejudices under which weak minds are servilely crouched. Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a god; because, if there be one, he must more approve the homage of reason, than that of blindfolded fear.

Thomas Jefferson (1743-1826) American political philosopher, polymath, statesman, US President (1801-09)
Letter (1787-08-10) to Peter Carr
    (Source)
 
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Brute force plays a much larger part in the government of the world than it did before 1914, and what is especially alarming, force tends increasingly to fall into the hands of those who are enemies of civilization. The danger is profound and terrible; it cannot be waved aside with easy optimism. The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.

Russell - stupid cocksure - wist_info

Bertrand Russell
Bertrand Russell (1872-1970) English mathematician and philosopher
“The Triumph of Stupidity,” New York American (1933-05-10)
    (Source)

Often paraphrased, "The trouble with the world is that the stupid are cocksure, and the intelligent are full of doubt." See also Yeats and Bukowski.

More examination of this quotation: The Best Lack All Conviction While the Worst Are Full of Passionate Intensity – Quote Investigator.
 
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MESSENGER: Nothing is more useful to mankind than a prudent distrust.

[ἌΓΓΕΛΟΣ:σώφρονος δ᾽ ἀπιστίας
οὐκ ἔστιν οὐδὲν χρησιμώτερον βροτοῖς.]

Euripides (485?-406? BC) Greek tragic dramatist
Helen [Ἑλένη], l. 1617ff (412 BC) [tr. Coleridge (1891)]
    (Source)

Informing Theoklymenos that Helen and Menelaos have escaped to Greece.

(Source (Greek)). Other translations:

Nought to man's welfare more
Avails, than disbelief by prudence rul'd.
[tr. Potter (1783), l. 1750ff]

There's nought more beneficial to mankind
Than wise distrust.
[tr. Wodhull (1809)]

But there is naught more useful to mortals than a wise distrust.
[tr. Buckley (1850)]

Nought is of more avail
For mortals' need than wise mistrustfulness.
[tr. Way (Loeb) (1912)]

My lord, I fear
There are advantages in honest doubt.
That lesson of my tale at least is clear.
[tr. Sheppard (1925)]

I say there's nothing of more use
to mortals than a wise suspension of belief.
[tr. Warner (1951)]

Well, there is one thing every man has to learn: it is, not to be too trustful.
[tr. Vellacott (1954)]

Man's most valuable trait
is a judicious sense of what not to believe.
[tr. Lattimore (1956)]

Knowing when not to believe someone ...
now that's the kind of wisdom we could use!
[tr. Meagher (1986)]

To sum up, there’s nothing more useful in life than showing a healthy scepticism.
[tr. Davie (2002)]

Ah! there is naught more serviceable to mankind than a prudent distrust.
[tr. Athenian Society (2006)]

Seems you were a bit naive, sir:
There's nothing more useful in life
Than a good suspicious nature.
[tr. A. Wilson (2007)]

Nothing is more useful than a prudent doubt.
[tr. Theodoridis (2011)]

Nothing is more useful to man than thoughtful skepticism.
[Ambrose et al. (2018)]

Nothing is more useful to mankind than a balanced [sōphrōn] distrust.
[tr. Coleridge / Helen Heroization Team]

 
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Doubt is not a pleasant condition, but certainty is an absurd one.

[Le doute n’est pas une état bien agréable, mais l’assurance est un état ridicule.]

Voltaire (1694-1778) French writer [pseud. of Francois-Marie Arouet]
Letter (1770-11-28) to Frederick William, Prince of Prussia [tr. Tallentyre (1919)]
    (Source)

The French is sometimes given (e.g.) as "Le doute n'est pas une condition agréable, mais la certitude est absurde."

(Source (French)). Alternate translations:

Doubt is not a very agreeable state, but certainty is a ridiculous one.
[tr. Robertson (1922)]

Doubt is not a pleasant condition, but certainty is absurd.
[E.g. (1994)]

Doubt is not an agreeable condition, but certainty is an absurd one.
[E.g.]

 
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In all affairs — love, religion, politics or business — it’s a healthy idea, now and then, to hang a question mark on the things you have long taken for granted.

Bertrand Russell
Bertrand Russell (1872-1970) English mathematician and philosopher
(Attributed)

Widely attributed to Russell, but not found in any of his online published works or cited to any source.

There are numerous variations on this quote, e.g.,

In all affairs it's a healthy idea now and then to hang a question mark on the things you have taken for granted.

And mixes and matches between those two.

Earliest references of long-form quotation I could find:I also found in Alexander Chittick, Social Evolution, "The Evolution of Capital and Labor" (1919), regarding the plight of laborers:

They should be taught [...] to take nothing for granted in love, religion, politics, or business.

The combination of taking for granted and the same list of four affair topics seems more than coincidence. Was Chittick riffing off of an unfound Russell comment? Did someone attribute a variation of Chittick's passage to Russell? The answer is unclear.
 
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