"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

January 1, 1970

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Albert Einstein
Original Language: English

Sources

"Principe de relativité" Archives des sciences physiques et naturelles (1910) ser. 4. 29 5-28 pp. 125–244, as quoted by Julian Barbour, "The Nature of Time" (Mar 20, 2009) p. 7, arXiv:0903.3489.