“You are the best kind of killer, Cassel Sharpe, the kind that never has blood on his hands. The kind that never has to sicken at the sight of what he's done, or come to like it too much.”
Source: Red Glove
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Holly Black 160
American children's fiction writer 1971Related quotes

“You can never do a kindness too soon, for you never know how soon it will be too late.”
Culture
1860s, The Conduct of Life (1860)
Variant: You cannot do a kindness too soon, for you never know how soon it will be too late.

Major Richard Sharpe, p. 94
Sharpe (Novel Series), Sharpe's Enemy (1984)

Franklin himself calls this an "old maxim" when he repeats it at page 48 http://www.ushistory.org/franklin/autobiography/page48.htm of his autobiography.
Franklin's recognition of this effect caused it to be named after him. Wikipedia, Ben Franklin Effect https://en.wikipedia.org/wiki/Ben_Franklin_effect.
Misattributed

“I have never asked for my position, never snatched or done any kind of scheming.”
2014, "GhoshanaPatra with Narendra Modi", 2014
Context: I never proposed my candidature for anything or for any post since I have been born. Decision [regarding] me is taken by BJP. I have never asked for my position, never snatched or done any kind of scheming. Whenever I have been bestowed a work I do it with full dedication, hard work and have sacrificed my life for it.
Part II, Chapter 5.1; conversation between Laura and her son Chris
Lightning (1988)

“I'd like to say that this time I'd kill myself too.. but I've never had that kind of courage.”
Source: Mercy