Quotations about   proof

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What the world wants iz good examples, not so mutch advice; advice may be wrong, but examples prove themselves.

Josh Billings (1818-1885) American humorist [pseud. of Henry Wheeler Shaw]
Everybody’s Friend, Or; Josh Billing’s Encyclopedia and Proverbial Philosophy of Wit and Humor, “Puddin and Milk” (1874)
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Added on 17-Jul-20 | Last updated 17-Jul-20
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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)
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Added on 1-Jun-20 | Last updated 1-Jun-20
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Science is the belief in the ignorance of the experts.

Richard Feynman (1918-1988) American physicist
“What Is Science?” address, National Science Teachers Association, New York (1966)
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Added on 4-Mar-20 | Last updated 4-Mar-20
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As to a hereafter, we have not the slightest evidence that there is any — no evidence that appeals to logic and reason. I have never seen what to me seemed an atom of proof that there is a future life. And yet — I am strongly inclined to expect one.

Mark Twain (1835-1910) American writer [pseud. of Samuel Clemens]
Quoted in Albert Bigelow Paine, Mark Twain: A Biography, Vol. 4, ch. 264 (1922)
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Added on 4-Mar-20 | Last updated 4-Mar-20
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You mean, your statistics are facts, but my facts are just statistics.

Jonathan Lynn (b. 1943) English actor, comedy writer, director
Yes, Prime Minister, S1E3 “The Smokescreen” (23 Jan 1986) [with Anthony Jay]
Added on 11-Feb-20 | Last updated 11-Feb-20
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Maturity begins when we’re content to feel we’re right about something without feeling the necessity to prove someone else wrong.

Sydney J. Harris (1917-1986) Anglo-American columnist, journalist, author
(Attributed)

Frequently attributed to Harris, but the original source has not been found. Earliest citation I could find was in Reader's Digest (1973), where it is further credited to the Publishers-Hall Syndicate.
Added on 10-Feb-20 | Last updated 10-Feb-20
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Details that could throw doubt on your interpretation must be given, if you know them. You must do the best you can — if you know anything at all wrong, or possibly wrong — to explain it. If you make a theory, for example, and advertise it, or put it out, then you must also put down all the facts that disagree with it, as well as those that agree with it. There is also a more subtle problem. When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition. In summary, the idea is to try to give all of the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

Richard Feynman (1918-1988) American physicist
“Cargo Cult Science,” commencement address, California Institute of Technology (1974)
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Added on 22-Jan-20 | Last updated 22-Jan-20
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Believe in truth. To abandon facts is to abandon freedom. If nothing is true, then no one can criticize power because there is no basis upon which to do so. If nothing is true, then all is spectacle. The biggest wallet pays for the most blinding lights.

Timothy Snyder (b. 1969) American historian, author
On Tyranny, ch. 10 (2017)
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Added on 7-Jun-18 | Last updated 7-Jun-18
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In our judgment of men, we are to beware of giving any great importance to occasional acts. By acts of occasional virtue weak men endeavour to redeem themselves in their own estimation, vain men to exalt themselves in that of mankind.

Henry Taylor (1800-1886) English dramatist, poet, bureaucrat, man of letters
The Statesman: An Ironical Treatise on the Art of Succeeding, ch. 3 (1836)
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Added on 8-Aug-17 | Last updated 8-Aug-17
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There is only one proof of ability — action.

[Für das Können gibt es nur einen Beweis: das Tun.]

Marie von Ebner-Eschenbach (1830-1916) Austrian writer
Aphorisms [Aphorismen] [tr. Wister (1883)]
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Alt. trans.: "There is only one proof of ability: doing it."
Added on 7-Aug-17 | Last updated 7-Aug-17
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Anger is the common substitute for logic among those who have no evidence for what they desperately want to believe.

Isaac Asimov (1920-1992) Russian-American author, polymath, biochemist
“The Tyrannosaurus Prescription”
Added on 29-Mar-16 | Last updated 29-Mar-16
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Everyone is prejudiced in favor his own powers of discernment, and will always find an argument most convincing if it leads to the conclusion he has reached for himself; everyone must then be given something he can grasp and recognize as his own idea.

Pliny the Younger (c. 61-c. 113) Roman politician, writer [Gaius Plinius Caecilius Secundus]
Letters, Book 1, Letter 20 [tr. Radice (1963)]
Added on 30-Jul-15 | Last updated 30-Jul-15
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There is something wonderful in seeing a wrong-headed majority assailed by truth.

John Kenneth Galbraith (1908-2006) Canadian-American economist, diplomat, author
The Guardian (28 Jul 1989)
Added on 24-Jun-15 | Last updated 24-Jun-15
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In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence. A wise man, therefore, proportions his belief to the evidence. […] No testimony is sufficient to establish a miracle, unless the testimony be of such a kind, that its falsehood would be more miraculous, than the fact, which it endeavors to establish.

David Hume (1711-1776) Scottish philosopher, economist, historian, empiricist
An Enquiry Concerning Human Understanding, Sec. 10 “Of Miracles,” Part 1 (1748)

Often given as just, "A wise man proportions his belief to the evidence."
Added on 24-Apr-15 | Last updated 24-Apr-15
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GEORGE: There is presumably a calendar date — a moment — when the onus of proof passed from the atheist to the believer, when, quite suddenly, secretly, the noes had it.

Tom Stoppard (b. 1937) Czech-English playwright and screenwriter
Jumpers, Act 1 (1972)
Added on 26-Sep-14 | Last updated 26-Sep-14
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Writers the most learned, the most accurate in details, and the soundest in tendency, frequently fall into a habit which can neither be cured nor pardoned — the habit of making history into the proof of their theories.

John Dalberg, Lord Acton (1834-1902) British historian
“The History of Freedom in Antiquity,” Speech, Bridgenorth Institute (28 Feb 1877)
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Added on 4-Mar-14 | Last updated 12-Feb-20
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The man of science has learned to believe in justification, not by faith, but by verification.

T. H. Huxley (1825-1895) English biologist [Thomas Henry Huxley]
“On the Advisableness of Improving Natural Knowledge” (1870)
Added on 18-Dec-13 | Last updated 18-Dec-13
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Times of trouble best discover the true worth of a man.

Thomas à Kempis (c. 1380-1471) German monk, author
The Imitation of Christ, Book 1, ch. 16 (c. 1418) [tr. L. Sherley-Price (1952)]
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Alt trans.: "The measure of every man's virtue is best revealed in time of adversity -- adversity that does not weaken a man but rather shows what he is."
Added on 5-Jun-09 | Last updated 14-Sep-16
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Extraordinary claims require extraordinary evidence.

Carl Sagan (1934-1996) American scientist and writer
Cosmos (1980)

Parallels a comment by Marcello Truzzi, "Extraordinary claims require extraordinary proof."
Added on 6-Aug-07 | Last updated 2-Aug-16
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When men have realized that time has upset many fighting faiths, they may come to believe even more than they believe the very foundations of their own conduct that the ultimate good desired is better reached by free trade in ideas — that the best test of truth is the power of the thought to get itself accepted in the competition of the market.

Oliver Wendell Holmes, Jr. (1841-1935) American jurist, Supreme Court Justice
Abrams v. United States, 250 U.S. 616, 630 (1919) [Dissent]
Added on 1-Feb-04 | Last updated 14-Jun-16
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I have argued flying saucers with lots of people. … I was interested in this: they keep arguing that it is possible. And that’s true. It is possible. They do not appreciate that the problem is not to demonstrate whether it’s possible or not, but whether it’s going on or not. Whether it’s probably occurring or not, not whether it could occur.

Richard Feynman (1918-1988) American physicist
The Meaning of It All (1998)
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Added on 1-Feb-04 | Last updated 10-Jan-20
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