“Whenever you feel an impulse to perpetrate a piece of exceptionally fine writing, obey it—whole-heartedly—and delete it before sending your manuscript to press. Murder your darlings.”
sic
On the Art of Writing: Lectures Delivered in the University of Cambridge, 1913–1914 http://www.bartleby.com/190/
Often misattributed, e.g. to Hemingway, Faulkner, and others, or shortened to 'Kill your darlings.' source http://www.randomhouse.ca/hazlitt/feature/should-you-kill-your-babies
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Arthur Quiller-Couch 7
British writer and literary critic 1863–1944Related quotes
“What I know is you can't go back. You can't press delete and re-key your life.”
Source: By the Time You Read This, I'll Be Dead
“change your hairstyle whenever you want, and whenever you feel like it, that is all.”
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Source: Light on Life: The Yoga Journey to Wholeness, Inner Peace, and Ultimate Freedom, p.xiv
As quoted in Why Americans Hate Politics, by E.J. Dionne, Jr., Simon & Schuster (2004) p. 267.

Re: Learning curve for common lisp http://groups.google.com/group/comp.lang.lisp/msg/4356934aa0d7c2fe (Usenet article).
Usenet articles, C++

“You feel fine, and then, when your body can't keep fighting, you don't.”
Source: A Walk to Remember
“What you can't get out of, get into whole-heartedly.”
The Complete Neurotic's Notebook (1981), Unclassified

Address to the Bundestag (27 January 1998) https://web.archive.org/web/20050307015224/http://www.mfa.gov.il/MFA/MFAArchive/1990_1999/1998/1/Address%20to%20the%20Bundestag-%20by%20Professor%20Yehuda%20Baue