“Writing is like getting married. One should never commit oneself until one is amazed at one's luck.”
The Black Prince (1973); 2003, p. 10.
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Iris Murdoch 61
British writer and philosopher 1919–1999Related quotes

“One should never use exclamation points in writing. It is like laughing at your own joke.”

“One should never write down or up to people, but out of yourself.”

“Innocence ends when one is stripped of the delusion that one likes oneself.”
Source: On Self-Respect

“There is only one way to make money at writing, and that is to marry a publisher's daughter.”
Source: Down and out in Paris and London (1933), Ch. 4; a record of a remark by Orwell's fellow tramp Boris

Literature and Revolution (1924), edited by William Keach (2005), Ch. 4 : Futurism, p. 120
Variants:
Art is not a mirror to hold up to society, but a hammer with which to shape it.
Remarks apparently derived from Trotsky's observations, or those he implies preceded his own, this is attributed to Bertolt Brecht in Paulo Freire : A Critical Encounter (1993) by Peter McLaren and Peter Leonard, p. 80, and to Vladimir Mayakovsky in The Political Psyche (1993) by Andrew Samuels, p. 9
Art is not a mirror held up to society, but a hammer with which to shape it.
Context: Art, it is said, is not a mirror, but a hammer: it does not reflect, it shapes. But at present even the handling of a hammer is taught with the help of a mirror, a sensitive film that records all the movements. Photography and motion-picture photography, owing to their passive accuracy of depiction, are becoming important educational instruments in the field of labor. If one cannot get along without a mirror, even in shaving oneself, how can one reconstruct oneself or one's life, without seeing oneself in the "mirror" of literature? Of course no one speaks about an exact mirror. No one even thinks of asking the new literature to have mirror-like impassivity. The deeper literature is, and the more it is imbued with the desire to shape life, the more significantly and dynamically it will be able to "picture" life.

This Business of Living (1935-1950)