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.
“No man ought to glory except in that which is his own.”
Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter XLI: On the god within us
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Seneca the Younger 225
Roman Stoic philosopher, statesman, and dramatist -4–65 BCRelated quotes
Draft of a reply to an invitation to join the Victoria Institute (1875), in Ch. 12 : Cambridge 1871 To 1879, p. 404
The Life of James Clerk Maxwell (1882)
“Every man, in his own opinion, forms an exception to the ordinary rules of morality.”
No. 305
Characteristics, in the manner of Rochefoucauld's Maxims (1823)
Speech at Birkbeck College (20 March 1924), quoted in On England, and Other Addresses (1926), p. 146.
1924
1840s, Heroes and Hero-Worship (1840), The Hero as Man of Letters
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 3.