Quotations about   proof

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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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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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