Philosopher
Mencius. Mengzi. c. 300 BC, bk. 6.
Mencius. Mencius, translated by D. C. Lau. Penguin Classics, 2005, bk. 6.
Locke, John. An Essay Concerning Humane Understanding. London: Thomas Basset, 1690, bk. 4, ch. 19, sect. 11.
Locke, John. An Essay Concerning Human Understanding, edited by Pauline Phemister. Oxford University Press, 2008, bk. 4, ch. 19, sect. 11.
Heraclitus. Quoted in Κρατύλος [Cratylus], by Plato. c. 348 BC, sect. 402a.
Heraclitus. Quoted in Craylus, by Plato. Aeterna Press, 2015, sect. 402a.
Aurelius, Marcus. Meditations. c. 180, bk. 4.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 4.
Hume, David. "The Sceptic." Essays, Moral, Political, and Literary. Edinburgh: A. Kincaid, 1758, pt. 1, no. 18.
Hume, David. "The Sceptic." Essays, Moral, Political, and Literary: Volumes 1 and 2, edited by Tom L. Beauchamp and Mark A Box. Oxford University Press, 2022, pt. 1, no. 18.
De Montaigne, Michel. "Que Philosopher C'Est Apprendre a Mourir [That to Study Philosophy is to Learn to Die]." Essais [Essays]. Paris: Simon Millanges and Jean Richer, 1580.
De Montaigne, Michel. "To Philosophize is to Learn How to Die." The Complete Essays, edited and translated by M. A. Screech. Penguin Classics, 1993.
Emerson, Ralph Waldo. "Eloquence." Society and Solitude. New York City: Fields, Osgood, & Co., 1870.
Emerson, Ralph Waldo. "Eloquence." The Collected Works of Ralph Waldo Emerson: Society and Solitude, edited by Ronald A. Bosco and Douglas Emory Wilson. Vol. 7, Belknap Press, 2008.
Spinoza, Baruch. Ethica, Ordine Geometrico Desmonstrata [Ethics, Demonstrated in Geometrical Order]. 1677, pt. 3, def. 13, explanation.
Spinoza, Benedict. Ethics, translated by Michael Silverthorne and Matthew J. Kinser. Cambridge University Press, 2018, pt. 3, def. 13, explanation.
De Montaigne, Michel. "De La Solitude [Of Solitude]." Essais [Essays]. Paris: Simon Millanges and Jean Richer, 1580.
De Montaigne, Michel. "Of Solitude." The Complete Essays, edited and translated by M. A. Screech. Penguin Classics, 1993.
Seneca the Younger. Epistulae Morales ad Lucilium [Moral Letters to Lucilius]. c. 65 AD.
Seneca, Lucius Annaeus. Letters on Ethics, translated by Margaret Graver and A. A. Long. University of Chicago Press, 2017.
Arendt, Hannah. The Origins of Totalitarianism. Schocken Books, 1951, pt. 3, ch. 12, sec. 3.
Pascal, Blaise. Pensées [Thoughts]. Paris: Chez G. Desprez, 1670, no. 139.
Pascal, Blaise. "Pensées." Pensées and Other Writings, edited by Anthony Levi, translated by Honor Levi. Oxford University Press, 2008, no. 139.
Quoted in Theaetetus, by Plato
Socrates. Quoted in Θεαίτητος [Theaetetus], written by Plato. c. 369 BC.
Socrates. Quoted in Theaetetus, written by Plato, translated by John McDowell. Oxford University Press, 2014.
Paine, Thomas. The Age of Reason, Part I. London: Joel Barlow, 1794.
Paine, Thomas. "The Age of Reason, Being an Investigation of True and Fabulous Theology (1794)." Selected Writings of Thomas Paine, edited by Ian Shapiro and Jane E. Calvert. Yale University Press, 2014.