“It is not by delusion, however exalted, that mankind can prosper, but only by unswerving courage in the pursuit of truth.”
"The Pursuit of Truth" in The Collected Papers of Bertrand Russell (1993)
Attributed from posthumous publications
Context: I cannot believe – and I say this with all the emphasis of which I am capable – that there can ever be any good excuse for refusing to face the evidence in favour of something unwelcome. It is not by delusion, however exalted, that mankind can prosper, but only by unswerving courage in the pursuit of truth.
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Bertrand Russell 562
logician, one of the first analytic philosophers and politi… 1872–1970Related quotes
Book 2; Exaltation of the Virtuous I
Mozi

A misquotation by Ronald Reagan in a 9 March 1982 speech, reported in Paul F. Boller, Jr., and John George, They Never Said It: A Book of Fake Quotes, Misquotes, & Misleading Attributions (1989), p. 13-14. In fact, Churchill used a very similar line ("To think you can make a man richer by putting on a tax is like a man thinking that he can stand in a bucket and lift himself up by the handle.") several times beginning with a speech at Free Trade Hall, Manchester, 19 February 1904.
Misattributed

Is there any hope in education?
1920s, Back to Methuselah (1921)
Context: In truth, mankind cannot be saved from without, by schoolmasters or any other sort of masters: it can only be lamed and enslaved by them. It is said that if you wash a cat it will never again wash itself. This may or may not be true: what is certain is that if you teach a man anything he will never learn it; and if you cure him of a disease he will be unable to cure himself the next time it attacks him.

The Autocrat of the Breakfast Table (1858)

“Only in books has mankind known perfect truth, love and beauty.”

Encyclical Fides et Ratio, 14 September 1998
Source: www.vatican.va http://www.vatican.va/holy_father/john_paul_ii/encyclicals/documents/hf_jp-ii_enc_14091998_fides-et-ratio_en.html