"If A is success in life, then A = x + y + z. Work is x, play is y and z is keeping your mouth shut."
— Albert Einstein

January 1, 1970

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Albert Einstein
Original Language: English

Sources

Said to Samuel J Woolf, Berlin, Summer 1929. Cited with additional notes in The Ultimate Quotable Einstein by Alice Calaprice and Freeman Dyson, Princeton UP (2010) p 230