Common sense is nothing more than a deposit of prejudices laid down by the mind before you reach eighteen.
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As quoted in Mathematics, Queen and Servant of the Sciences (1952) by Eric Temple Bell, p. 42. Bell did not indicate if he heard the quote from Einstein himself though, and it appeared earlier in Harper's Magazine: Volume 196 containing issues from 1948, on p. 473, so possibly Bell was just repeating a phrase he had read in this or some other earlier source. The Ultimate Quotable Einstein by Alice Calaprice lists this as "probably not by Einstein", so its accuracy is questionable.
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Unsourced variant : Common sense is the collection of prejudices acquired by age eighteen.Albert Einstein
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