Bertrand Russell Quotes on Rationality
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It is undesirable to believe a proposition when there is no ground whatever for supposing it true.
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The quarrel between Hume and Rousseau is symbolic: Rousseau was mad but influential, Hume was sane but had no followers.
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Not to be absolutely certain is, I think, one of the essential things in rationality.
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Man is a rational animal - so at least I have been told. Throughout a long life, I have looked diligently for evidence in favor of this statement, but so far I have not had the good fortune to come across it, though I have searched in many countries spread over three continents.