“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

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
1920s
Variant: If A is success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.

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Albert Einstein 702

German-born physicist and founder of the theory of relativi… 1879–1955

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u = \pm \frac{1}{2} \sqrt{a^2 - 4b}.andx = u + z = -\frac{1}{2}a \pm \sqrt{a^2 - 4b}.</center”

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“The artist's feeling is his law. Genuine feeling can never be contrary to nature; it is always in harmony with her. But another person's feelings should never be imposed on us as law. Spiritual affinity leads to similarity in work, but such affinity is something entirely different from mimicry. Whatever people may say of Y's paintings and how they often resemble Z's, yet they proceed from Y and are his sole property.”

Caspar David Friedrich (1774–1840) Swedish painter

Quote from Friedrich's writings Thoughts on Art, Caspar David Friedrich; as cited in Letters of the great artists – from Blake to Pollock, Richard Friedenthal, Thames and Hudson, London, 1963, p. 32
Variant translation:
The artist's feeling is his law. Pure sensibility can never be Unnatural; it is always in harmony with nature. But the feelings of another must never be imposed on us as our law. Spiritual relationship produces artistic resemblance, but this relationship is very different from imitation. Whatever one may say about X.'s paintings, and however much they may resemble Y.'s, they originated in him and are his own. (** In: 'Caspar David Friedrich's Medieval Burials', Karl Whittington - http://www.19thc-artworldwide.org/spring12/whittington-on-caspar-david-friedrichs-medieval-burials)
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