“No good deed goes unpunished.”

Source: Angels & Demons

Roman Candle (Leticia Baldridge), p. 129 (1956)
Source: This famous quip was first quoted in print by Luce's social secretary Letitia Baldrige in Roman Candle (Houghton Mifflin, Boston, 1956), 129: "When I would entreat her to engage in resolving a specific case, she replied, 'No good deed goes unpunished, Tish, remember that.'" Oscar Wilde, Billy Wilder, and Andrew Mellon have also been cited as sources, but without written evidence.

Source: Born of Fire

Source: Grist magazine, January 3, 2005.

[In the Company of the Holy Mother, 124-125]

τί λοιπὸν ἢ ἀπολαύειν τοῦ ζῆν συνάπτοντα ἄλλο ἐπ ἄλλῳ ἀγαθόν, ὥστε μηδὲ τὸ βραχύτατον διάστημα ἀπολείπειν;
XII, 29
Meditations (c. 121–180 AD), Book XII

Misnad al-Imām al-Hādī, p. 302.
Religious Wisdom

Source: Gargantua and Pantagruel (1532–1564), Fourth Book (1548, 1552), Chapter 49.