“Fiction is to the grown man what play is to the child”
A Gossip on Romance, printed in Longman's Magazine (November 1882).
Context: Fiction is to the grown man what play is to the child; it is there that he changes the atmosphere and tenor of his life.
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Robert Louis Stevenson 118
Scottish novelist, poet, essayist, and travel writer 1850–1894Related quotes

“If the child was helpless, was the grown up person, man or woman, in a much better position?”
Source: Liberalism (1911), Chapter IV, "Laissez - Faire", p. 46.

Interviews
Source: On how she once perceived fiction in “NK Jemisin: 'It’s easier to get a book set in black Africa published if you're white'” https://www.theguardian.com/books/2020/may/02/nk-jemisin-its-easier-to-get-a-book-set-in-black-africa-published-if-youre-white in The Guardian (2020 May 2)

Source: Culture and Value (1980), p. 17e
"An Unread Book," introduction to The Man Who Loved Children by Christina Stead (Holt, Rinehart, 1965 edition)
General sources

“A play is fiction — and fiction is fact distilled into truth.”
The New York Times (18 September 1966)

“Man's maturity: to have regained the seriousness that he had as a child at play.”
Variant: The maturity of man—that means, to have reacquired the seriousness that one had as a child at play
Source: Beyond Good and Evil

“Eternity is a child playing, playing checkers; the kingdom belongs to a child.”
Quoted by Hippolytus, Refutation of all heresies, IX, 9, 4 (Fragment 52), as translated in Reality (1994), by Carl Avren Levenson and Jonathan Westphal, p. 10
Variants:
History is a child building a sand-castle by the sea, and that child is the whole majesty of man’s power in the world.
As quoted in Contemporary Literature in Translation (1976), p. 21
A lifetime is a child playing, playing checkers; the kingdom belongs to a child.
As quoted in The Beginning of All Wisdom: Timeless Advice from the Ancient Greeks (2003) by Steven Stavropoulos, p. 95
Time is a game played beautifully by children.
As quoted in Fragments (2001) translated by Brooks Haxton
Lifetime is a child at play, moving pieces in a game. Kingship belongs to the child.
As quoted in The Art and Thought of Heraclitus (1979) translated by Charles H. Kahn

“In the child, we see the grown-up. I see the problem differently.”
To Leon Goldensohn, March 1, 1946, after Goldensohn asks Ohlendorf, "How did you figure a six month old Jewish infant must be killed - was it an enemy? Quoted in "The Nuremberg Interviews" by Leon Goldensohn, Robert Gellately - History - 2004.