“A minister of state is excusable for the harm he does when the helm of government has forced his hand in a storm; but in the calm he is guilty of all the good he does not do.”
Un ministre est excusable du mal qu’il fait, lorsque le gouvernail de l’État est forcé dans sa main par les tempêtes; mais dans le calme il est coupable de tout le bien qu’il ne fait pas.
Le Siècle de Louis XIV, ch. VI: "État de la France jusqu’à la mort du cardinal Mazarin en 1661" (1752) Unsourced paraphrase or variant translation: Every man is guilty of all the good he did not do.
Citas
Original
Un ministre est excusable du mal qu’il fait, lorsque le gouvernail de l’État est forcé dans sa main par les tempêtes; mais dans le calme il est coupable de tout le bien qu’il ne fait pas.
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Voltaire 167
French writer, historian, and philosopher 1694–1778Related quotes

“The flea, though he kill none, he does all the harm he can.”
Meditation 12
Devotions Upon Emergent Occasions (1624)

At Brian Hayes on 4 July 2013 http://www.kildarestreet.com/sendebates/?id=2013-07-04a.180&s=speaker%3A210#g310

“Love is not always evil, truth to tell;
Though harm he does, he serves the good as well.”
Dunque Amor sempre rio non si ritrova:
Se spesso nuoce, anco talvolta giova.
Canto XXV, stanza 2 (tr. B. Reynolds)
Orlando Furioso (1532)

Article 19
"Declaration of Rights" http://knarf.english.upenn.edu/PShelley/declarat.html (1812)
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 77.

“Only when he no longer knows what he is doing does the painter do good things.”
Quoted in Artists on Art: From the XIV to the XX Century, ed. Robert Goldwater (Pantheon, 1945)
quotes, undated