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Science alone of all the subjects contains within itself the lesson of the danger of belief in the infallibility of the greatest teachers of the preceding generation.

— Richard Feynman

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Source: address "What is Science?", presented at the fifteenth annual meeting of the National Science Teachers Association, in New York City (1966), published in The Physics Teacher, volume 7, issue 6 (1969), p. 313-320
Source quality: Precise citation Points to a specific work with a page, chapter, date or similar locator, so you can look it up.

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I don't know anything, but I do know that everything is interesting if you go into it deeply enough.

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The first principle is that you must not fool yourself — and you are the easiest person to fool.

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Attribution

Quote text and notes from Wikiquote: Richard Feynman (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.