“To be good, and to do good, is the whole duty of man comprised in a few words.”
Letter to Elizabeth Shaw (1784), quoted in John Adams (2001) by David McCullough, p. 310
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Abigail Adams 40
2nd First Lady of the United States (1797–1801) 1744–1818Related quotes

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.

“A man’s word must be as good as an oath sworn beneath the Light or it was no good at all.”
Source: (January 2004), Chapter 1: The Hook. p. 6

“I don't aspire to be a good man. I aspire to be a whole man.”

“An honest man's word is as good as his bond.”
Source: Don Quixote de la Mancha (1605–1615), Part II (1615), Book IV, Ch. 34.

“To a wise man, the whole earth is open; for the native land of a good soul is the whole earth.”
Freeman (1948), p. 166
Durant (1939), Ch. XVI, §II, p. 352 (footnote); citing F. Uberweg, History of Philosophy, New York, 1871, vol. 1, p. 71.
Variant: To a wise and good man the whole earth is his fatherland.
“Few women care what a man looks like, and a good thing too.”
The Complete Neurotic's Notebook (1981), Women & men

“In a word, man in London is not quite so good a creature as he is out of it.”
The Ayrshire Legatees (Edinburgh: Blackwood, [1821] 1823) pp. 163-4.