“I do nobody harm, I say none harm, I think none harm, but wish everybody good. And if this be not enough to keep a man alive, in good faith, I long not to live.”

— Thomas More

Thomas More's Account, in a letter to his daughter Margaret Roper, of his Second Interrogation

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Thomas More 26

English Renaissance humanist 1478–1535

Diana Wynne Jones (1934–2011) English children's fantasy writer

Source: Castle Series, Castle in the Air (1990), pp. 102-103.

“That which is good for the enemy harms you, and that which is good for you harms the enemy.”

Niccolo Machiavelli book The Art of War

Quello che giova al nimico nuoce a te, e quel che giova a te nuoce al nimico.
Rule 1 from Machiavelli's Lord Fabrizio Colonna: libro settimo (Book 7) http://babel.hathitrust.org/cgi/pt?id=njp.32101013672561;view=1up;seq=176 (Modern Italian uses nemico instead of nimico.)
The Art of War (1520)

“The power to do good is also the power to do harm; those who control the power today may not tomorrow; and, more important, what one man regards as good, another may regard as harm.”

Milton Friedman book Capitalism and Freedom

Introduction, p. 3
Capitalism and Freedom (1962)

“At least so far, it’s climate change policy that’s doing harm. Climate change itself is probably doing good; or at least, more good than harm.”

Tony Abbott (1957) Australian politician

Quoted in "Tony Abbott says climate change is 'probably doing good'" https://www.theguardian.com/australia-news/2017/oct/10/tony-abbott-says-climate-change-is-probably-doing-good, The Guardian, October 10, 2017
2017

“If any man can convince me and bring home to me that I do not think or act aright, gladly will I change; for I search after truth, by which man never yet was harmed. But he is harmed who abideth on still in his deception and ignorance.”

Marcus Aurelius book Meditations

Variant translation: If someone is able to show me that what I think or do is not right, I will happily change, for I seek the truth, by which no one ever was truly harmed. Harmed is the person who continues in his self-deception and ignorance.
VI, 21
Source: Meditations (c. 121–180 AD), Book VI