“The power of good is shown not by triumphantly conquering evil, but by continuing to resist evil while facing certain defeat.”

Source: The Life and Adventures of Santa Claus

Ibid., p. 88-96.
1880s

Non-Violent Resistance - Often misquoted as "You assist an evil system most effectively by obeying its orders and decrees. An evil system never deserves such allegiance."
Posthumous publications (1950s and later)
Context: You assist an unjust administration most effectively by obeying its orders and decrees. An evil administration never deserves such allegiance. Allegiance to it means partaking of the evil.
A good person will resist an evil system with his whole soul. Disobedience of the laws of an evil state is therefore a duty.

Source: Pali Canon, Sutta Pitaka, Khuddaka Nikaya (Minor Collection), Dhammapada, Ch. 17, Verse 223

Of Courage, Chap. xxix.
Bartlett's Familiar Quotations, 10th ed. (1919)

Source: Invisible Man

Source: Cerulean Sins

Source: Guide for the Perplexed (c. 1190), Part III, Ch.10