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By a clock we understand anything characterized by a phenomenon passing periodically through identical phases so that we must assume, by the principle of sufficient reason, that all that happens in a given period is identical with all that happens in an arbitrary period.

— Albert Einstein

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More quotes by Albert Einstein

Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods.

Essay to Leo Baeck (1953)

A happy man is too satisfied with the present to dwell too much on the future.

Try to become not a man of success, but try rather to become a man of value.

Life is like riding a bicycle. To keep your balance you must keep moving.

Generations to come, it may well be, will scarce believe that such a man as this one ever in flesh and blood walked upon this Earth.

Statement on the occasion of Gandhi's 70th birthday (1939)

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