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— William James"In order to disprove the assertion that all crows are black, one white crow is sufficient."
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He had a certain air of being a handsome man-which he was not; and a certain air of being a well-bred man-which he was not. It was mere swagger and challenge; but in this particular, as in many others, blustering assertion goes for proof, half over the world.
— Charles Dickens
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The man who has learned that three plus one are four doesn't have to go through a proof of that assertion with coins, or dice, or chess pieces, or pencils. He knows it, and that's that. He cannot conceive a different sum. There are mathematicians who say that three plus one is a tautology for four, a different way of saying "four" ... If three plus one can be two, or fourteen, then reason is madness.
— Jorge Luis Borges
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