In Search of the Miraculous (1949)
“How does it become a man to behave toward this American government today? I answered that he cannot without disgrace be associated with it.”
Civil Disobedience (1849)
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Henry David Thoreau 385
1817-1862 American poet, essayist, naturalist, and abolitio… 1817–1862Related quotes

Aristotle, 9.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 5: The Peripatetics

Part 3: "The Sense of Human Dignity", §3 (p. 56) <!-- I find this cited in several places but not actually quoted in full anywhere. -->
Science and Human Values (1956, 1965)
Context: Positivists and analysts alike believe that the words is and ought belong to different worlds, so that sentences which are constructed with is usually have verifiable meaning, but sentences constructed with ought never have. This is because Ludwig Wittgenstein's unit, and Bertrand Russell's unit, is one man; all British empiricist philosophy is individualist. And it is of course clear that if the only criterion of true and false which a man accepts is that man's, then he has no base for social agreement. The question of how man ought to behave is a social question, which always involves several people; and if he accepts no evidence and no judgment except his own, he has no tools with which to frame an answer.
Source: Something More, A Consideration of the Vast, Undeveloped Resources of Life (1920), p. 31

“An American Government cannot permit Americans to starve.”
1930s, Address at San Diego Exposition (1935)

“A man cannot become a child again, or he becomes childish.”
Grundrisse (1857-1858)
Source: Introduction, p. 31.

Section III, p. 7
Natural Law; or The Science of Justice (1882), Chapter I. The Science of Justice.