“A wrongdoer is often a man who has left something undone, not always one who has done something.”
Ἀδικεῖ πολλάκις ὁ μὴ ποιῶν τι, οὐ μόνον ὁ ποιῶν τι.
IX, 5
Source: Meditations (c. 121–180 AD), Book IX
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

“I suppose if a man has something once, always something of it remains.”
Source: For Whom the Bell Tolls

“When a man has no enemy left there must be something mean about him.”
Vera; or, The Nihilists (1880)

Variant: There has to be this pioneer, the individual who has the courage, the ambition to overcome the obstacles that always develop when one tries to do something worth while, especially when it is new and different.
Source: Adventures of a White-Collar Man. 1941, p. 127

“What is a highbrow? He is a man who has found something more interesting than women.”
New York Times, 24 January 1932, sec.8, p. 6

On literary prizes only awarded to women in “Annie Proulx: ‘I’ve had a life. I see how slippery things can be’” https://www.theguardian.com/books/2016/jun/05/annie-proulx-ive-had-a-life-i-see-how-slippery-things-can-be in The Guardian (2016 Jun 5)
Personal life and writing career

As quoted in The Oxford Dictionary of Literary Quotations (1997) edited by Peter Kemp, p. 303

Alfred P. Sloan. quoted in: John Bourne (2000), Learning Effectiveness and Faculty Satisfaction. p. 11