In a letter to Heinrich Wilhelm Matthias Olbers (14 May 1826), defending Chevalier d'Angos against presumption of guilt (by Johann Franz Encke and others), of having falsely claimed to have discovered a comet in 1784; as quoted in Calculus Gems (1992) by George F. Simmons
“The proof of battle is action, proof of words, debate.”
XVI. 630 (tr. Robert Fagles).
Iliad (c. 750 BC)
Original
Ἐν γὰρ χερσὶ τέλος πολέμου, ἐπέων δ' ἐνὶ βουλῇ.
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Homér 217
Ancient Greek epic poet, author of the Iliad and the OdysseyRelated quotes
“A multitude of words is no proof of a prudent mind.”
As quoted in Diogenes Laërtius, The Lives and Opinions of Eminent Philosophers, I, 35; as translated in Dictionary of Quotations (Classical) edited by Thomas Benfield Harbottle, p. 455
Also translated as: "Many words do not declare an understanding heart."
Lecture II : The Universal Categories, §3. Laws: Nominalism, CP 5.65
Pragmatism and Pragmaticism (1903)
Context: All nature abounds in proofs of other influences than merely mechanical action, even in the physical world. They crowd in upon us at the rate of several every minute. And my observation of men has led me to this little generalization. Speaking only of men who really think for themselves and not of mere reporters, I have not found that it is the men whose lives are mostly passed within the four walls of a physical laboratory who are most inclined to be satisfied with a purely mechanical metaphysics. On the contrary, the more clearly they understand how physical forces work the more incredible it seems to them that such action should explain what happens out of doors. A larger proportion of materialists and agnostics is to be found among the thinking physiologists and other naturalists, and the largest proportion of all among those who derive their ideas of physical science from reading popular books.
“The scientist believes in proof without certainty, the bigot in certainty without proof.”
The second sentence is often misquoted as “Science has proof without any certainty. Creationists have certainty without any proof.” or “Religion gives us certainty without proof; science gives us proof without certainty.”
Context: 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.
Source: Reflections and Maxims (1746), p. 184.