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Quotations about certainty
Note that not all quotations have been tagged, so the Search function may find additional quotations on this topic.
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)
Knowledge breeds doubt, not certainty, and the more we know the more uncertain we become.
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)
I tore myself away from the safe comfort of certainties through my love for truth — and truth rewarded me.
Simone de Beauvoir (1908-1986) French author, existentialist philosopher, feminist theorist
All Said and Done (1974)
(Source)
Dogma thinks it knows. Belief knows it does not. Dogma is credulous. Belief is sceptical, but forever open-minded.
Graham Dunstan Martin (1932-2021) British author, translator, philologist
Shadows in the Cave (1990)
A common fallacy in much of the adverse criticism to which science is subjected today is that it claims certainty, infallibility and complete emotional objectivity. It would be more nearly true to say that it is based upon wonder, adventure and hope.
Cyril Norman Hinshelwood (1897-1967) British chemist and Nobel laureate
“Classics among the intellectual disciplines,” Presidential Address to the Classical Association, Hull, UK (9 Apr 1959)
It must be remembered that evidence is never complete, that knowledge of truth is always partial, and that to await certainty is to await eternity.
John Bowlby 1907-1990) British psychologist, psychiatrist, psychoanalyst
Maternal Care and Mental Health (1951)
(Source)
The last phrase is often attributed to Jonas Salk, who used it ("It is said to await certainty is to await eternity") in a telegram to Basil O'Connor (8 Nov 1954). But as Salk himself noted, it was not original to him.
Since we can never know anything for sure, it is simply not worth searching for certainty; but it is well worth searching for truth; and we do this chiefly by searching for mistakes, so that we have to correct them.
Sir Karl Popper (1902-1994) Austrian-British philosopher
“Knowledge and the Shaping of Reality,” lecture, Alpbach (Aug 1982)
(Source)
Reprinted in In Search of a Better World, ch. 1 (1994).
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]
What certainty can there be in a Philosophy which consists in as many Hypotheses as there are Phenomena to be explained. To explain all nature is too difficult a task for any one man or even for any one age. ‘Tis much better to do a little with certainty, & leave the rest for others that come after you, than to explain all things by conjecture without making sure of any thing.
Isaac Newton (1642-1727) English physicist and mathematician
Opticks, Preface (unpublished) (1703)
(Source)
Bigotry and science can have no communication with each other, for science begins where bigotry and absolute certainty end. The scientist believes in proof without certainty, the bigot in certainty without proof. Let us never forget that tyranny most often springs from a fanatical faith in the absoluteness of one’s beliefs.
Ashley Montagu (1905-1999) British-American anthropologist and humanist [b. Israel Ehrenberg, a/k/a Montague Francis Ashley-Montagu]
Science and Creationism, Introduction (1984)
The second sentence is frequently (mis)quoted:
- "Science has proof without any certainty. Creationists have certainty without any proof."
- "Religion gives us certainty without proof; science gives us proof without certainty."
As mathematical and absolute certainty is seldom to be attained in human affairs, reason and public utility require that judges and all mankind in forming their opinions of the truth of facts should be regulated by the superior number of the probabilities on the one side or the other whether the amount of these probabilities be expressed in words and arguments or by figures and numbers.
William Murray, 1st Earl of Mansfield (1705-1793) British barrister, politician, judge, legal reformer
In Andrew Stuart, Letters to the Right Honorable Lord Mansfield (1773)
(Source)
A restatement by Stuart of a point Mansfield made.
There is no such thing as absolute certainty, but there is assurance sufficient for the purposes of human life.
John Stuart Mill (1806-1873) English philosopher and economist
On Liberty, ch. 2 (1959)
(Source)
Mill is actually describing an argument he goes on to counter.
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]
Certainty has become a consumer product. It is marketed the world over — by insurance companies, investment advisers, election campaigns, and the medical industry.
Gerd Gigerenzer (b. 1947) German research psychologist
Reckoning with Risk (2003)
Man must accept the responsibility for himself and the fact that only by using his own powers can he give meaning to his life. But meaning does not imply certainty; indeed, the quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel a man to unfold his powers. If he faces the truth without panic, he will recognize that there is no meaning to life except the meaning man gives his life by the unfolding of his powers, by living productively.
Erich Fromm (1900-1980) American psychoanalyst and social philosopher
Man for Himself, ch. 3 (1947)
(Source)
I believe in evil. It is the property of all those who are certain of truth. Despair and fanaticism are only differing manifestations of evil.
Edward Teller (1908-2003) Hungarian-American theoretical physicist
(Attributed)
Quoted in István Hargittai, The Martians of Science: Five Physicists Who Changed the Twentieth Century (2006), via Judith Shoolery.
It has often and confidently been asserted, that man’s origin can never be known: but ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
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)
There is nobody, in the commonwealth of learning, who does not profess himself a lover of truth, — and there is not a rational creature, that would not take it amiss, to be thought otherwise of. And yet, for all this, one may truly say, there are very few lovers of truth, for truth-sake, even amongst those who persuade themselves that they are so. How a man may know, whether he be so, in earnest, is worth inquiry; and I think, there is this one unerring mark of it, viz. the not entertaining any proposition with greater assurance than the proofs it is built on will warrant. Whoever goes beyond this measure of assent, it is plain, receives not truth in the love of it, loves not truth for truth-sake, but for some other by-end.
John Locke (1632-1704) English philosopher
An Essay Concerning Human Understanding, Book 4 “Of Knowledge and Opinion,” ch. 19 “Of Enthusiasm,” sec. 1 “Love of truth necessary” (1689)
(Source)
We are never so certain of our knowledge as when we’re dead wrong.
Adair Lara (b. 1952) American writer, columnist, teacher
“A Lot of Knowledge Is Dangerous, Too,” San Francisco Chronicle (9 Oct 1997)
(Source)
The certainties of one age are the problems of the next.
R. H. Tawney (1880-1962) English writer, economist, historian, social critic [Richard Henry Tawney]
Religion and the Rise of Capitalism, ch. 5 (1926)
(Source)
So we have to make guesses in order to give any utility at all to science. In order to avoid simply describing experiments that have been done, we have to propose laws beyond their observed range. There is nothing wrong with that, despite the fact that it makes science uncertain. If you thought before that science was certain — well, that is just an error on your part.
Richard Feynman (1918-1988) American physicist
The Character of Physical Law, ch. 3 “The Great Conservation Principles” (1965)
(Source)
Ah, what a dusty answer gets the soul
When hot for certainties in this our life!
He took my seat and smiled again, like an affable crocodile. He was probably a very principled man, too. So were they all, all principled men. And women. There were few things more annoying than a visibly principled person. Or more troublesome. Most of the ones I’d met could have used a little uncertainty to dilute their principled-ness.
It’s said that science will dehumanize people and turn them into numbers. That’s false, tragically false. Look for yourself. This is the concentration camp and crematorium at Auschwitz. This is where people were turned into numbers. Into this pond were flushed the ashes of some four million people. And that was not done by gas. It was done by arrogance, it was done by dogma, it was done by ignorance. When people believe that they have absolute knowledge, with no test in reality, this is how they behave. This is what men do when they aspire to the knowledge of gods.
Jacob Bronowski (1908-1974) Polish-English humanist and mathematician
The Ascent of Man, Ep. 11 “Knowledge or Certainty” (1973)
Doubt thou the stars are fire;
Doubt that the sun doth move;
Doubt truth to be a liar;
But never doubt I love.
I am often inclined to be envious of other people’s religion. They are so cocksure dogmatically that they act as though they are omniscient. Life has no doubts, its direction is determined, all evil is by hypothesis overruled by an all-wise God for good. I do not share this view of life, any more than I share the Christian Science views of disease, but I can see that it makes people enthusiastic, effective, self-forgetful and often fanatical and great bores.
Henry Joel Cadbury (1883-1974) American biblical scholar, Quaker historian, writer, activist
“My Personal Religion,” lecture, Harvard School of Divinity (1936)
(Source)
The problem is that the people with the most ridiculous ideas are always the people who are most certain of them.
William "Bill" Maher (b. 1956) American comedian, political commentator, critic, television host.
The Decider (21 Jul 2007)
So as this only point among the rest remaineth sure and certain, namely, that nothing is certain.
Pliny the Elder (AD 23-79) Roman author, naturalist, philosopher, military commander [Gaius Plinius Secundus]
Natural History, Book 2, ch. 7 (AD 77-79)
It is the dull man who is always sure, and the sure man who is always dull.
H.L. Mencken (1880-1956) American writer and journalist [Henry Lewis Mencken]
“The National Letters,” Prejudices: Second Series (1920)
(Source)
Inspect every piece of pseudoscience and you will find a security blanket, a thumb to suck, a skirt to hold. What does the scientist have to offer in exchange? Uncertainty! Insecurity!
Isaac Asimov (1920-1992) Russian-American author, polymath, biochemist
Asimov’s Guide to Science (1972)
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)
‘Tis impossible to be sure of any thing but Death and Taxes.
Christopher Bullock (1690?-1724) English actor and dramatist
The Cobler of Preston (1716)
I am an atheist, out and out. It took me a long time to say it. I’ve been an atheist for years and years, but somehow I felt it was intellectually unrespectable to say one was an atheist, because it assumed knowledge that one didn’t have. Somehow it was better to say one was a humanist or an agnostic. I finally decided that I’m a creature of emotion as well as of reason. Emotionally I am an atheist. I don’t have the evidence to prove that God doesn’t exist, but I so strongly suspect he doesn’t that I don’t want to waste my time.
Isaac Asimov (1920-1992) Russian-American author, polymath, biochemist
Free Inquiry (Spring 1982)
They lied to you. The Devil is not the Prince of Matter; the Devil is the arrogance of the spirit, faith without smile, truth that is never seized by doubt. The Devil is grim because he knows where he is going, and, in moving, he always returns whence he came.
Umberto Eco (1932-2016) Italian semiotician, essayist, philosopher, novelist
The Name of the Rose (1980)
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)
The essence of the Liberal outlook lies not in what opinions are held, but in how they are held: instead of being held dogmatically, they are held tentatively, and with a consciousness that new evidence may at any moment lead to their abandonment.
Bertrand Russell (1872-1970) English mathematician and philosopher
“Philosophy and Politics” (1946)
(Source)
Our new Constitution is now established, and has an appearance that promises permanency, but in this world nothing can be said to be certain, except death and taxes.
To refuse a hearing to an opinion because they are sure that it is false, is to assume that their certainty is the same thing as absolute certainty. All silencing of discussion is an assumption of infallibility.
It is this belief in absolutes, I would hazard, that is the great enemy today of the life of the mind. This may seem a rash proposition. The fashion of the time is to denounce relativism as the root of all evil. But history suggests that the damage done to humanity by the relativist is far less than the damage done by the absolutist — by the fellow who, as Mr. Dooley once put it, “does what he thinks th’ Lord wud do if He only knew th’ facts in th’ case.”
Arthur M. Schlesinger, Jr. (1917-2007) American historian, author, social critic
“The Opening of the American Mind,” New York Times (23 Jul 1989)
To be effective a doctrine must not be understood, but has to be believed in. We can be absolutely certain only about things we do not understand. A doctrine that is understood is shorn of its strength.
Eric Hoffer (1902-1983) American writer, philosopher, longshoreman
The True Believer, ch. 57 (1951)
Human beings are perhaps never more frightening than when they are convinced beyond doubt that they are right.
Sir Laurens Jan van der Post (1906-1996) Afrikaner author, conservationist, statesman, humanitarian [a.k.a. Laurens van der Post]
The Lost World of the Kalahari, ch. 3 (1958)
Not to be absolutely certain is, I think, one of the essential things in rationality.
Bertrand Russell (1872-1970) English mathematician and philosopher
“Am I An Atheist Or An Agnostic?” (1947)
(Source)
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 (1956)
And, to conclude, he that leaveth nothing to Chance will do few things ill, but he will do very few things.
George Savile, Marquis of Halifax (1633-1695) English politician and essayist
“Of Caution and Suspicion,” Political, Moral, and Miscellaneous Thoughts and Reflections (1750)
(Source)
Sometimes incorrectly attributed to Edward Wood, Earl of Halifax (1881-1959).
The greater the ignorance the greater the dogmatism.
Sir William Osler (1849-1919) Canadian physician
Montreal Medical Journal (1902)
Doubt is not a pleasant condition, but certainty is an absurd one.
[Le doute n’est pas une condition agréable, mais la certitude est absurde.]
Voltaire (1694-1778) French writer [pseud. of Francois-Marie Arouet]
Letter to Frederick William, Prince of Prussia (28 Nov 1770) [tr. Tallentyre (1919)]
(Source)
Alt trans.
- "Doubt is not a pleasant condition, but certainty is absurd."
- "Doubt is not an agreeable condition, but certainty is an absurd one."
- "Doubt is not a very agreeable state, but certainty is a ridiculous one."
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)
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."
Too much positive is either scared or stupid or both. Reality is uncertain.
Robert B. Parker (1932-2010) American writer
Early Autumn (1981)
The causes of the Great Depression are still far from certain. A lack of certainty, it may also be observed, is not evident in the contemporary writing on the subject. Much of it tells what went wrong and why with marked firmness. However, this paradoxically can itself be an indication of uncertainty. When people are least sure they are often most dogmatic.
John Kenneth Galbraith (1908-2006) Canadian-American economist, diplomat, author
The Great Crash, 1929, ch. 9 “Cause and Consequence,” sec. 3 (1954)
(Source)
The spirit of liberty is the spirit which is not too sure that it is right; the spirit of liberty is the spirit which seeks to understand the mind of other men and women; the spirit of liberty is the spirit which weighs their interests alongside its own without bias; the spirit of liberty remembers that not even a sparrow falls to earth unheeded; the spirit of liberty is the spirit of Him who, near two thousand years ago, taught mankind that lesson it has never learned but never quite forgotten; that there may be a kingdom where the least shall be heard and considered side by side with the greatest.
Learned Hand (1872-1961) American jurist
“The Spirit of Liberty,” speech, “I Am an American Day,” New York (21 May 1941)
(Source)
The longing for certainty and repose is in every human mind. But certainty generally is an illusion, and repose is not the destiny of man.
Oliver Wendell Holmes, Jr. (1841-1935) American jurist, Supreme Court Justice
“The Path of Law,” 10 Harvard Law Review 457 (1897)
(Source)
Scientists take it for granted that it is perfectly consistent to be unsure — that it is possible to live and not know. But I don’t know whether everyone realizes that this is true.
Richard Feynman (1918-1988) American physicist
What Do You Care What Other People Think? (1988)
