Latin
Boethius. De Consolatione Philosophiae [On the Consolation of Philosophy]. 524, bk. 1, poem 4.
Boethius. The Consolation of Philosophy, translated by Victor Watts. Penguin Classics, 1999, bk. 1, poem 4.
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.
Horace. Epistularum liber primus [First Book of Letters]. 20 BC, bk. 1, epistle 2.
Horace. "Epistles." Satires and Epistles, translated by John Davie. Oxford University Press, 2011, bk. 1, epistle 2.
Saint Anselm. Proslogium [Proslogion]. c. 1078, ch. 3.
Saint Anselm. "Proslogion." Anselm of Canterbury: The Major Works, edited by Brian Davies and G. R. Evans. Oxford University Press, 2008, ch. 3.
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.
Sextus Propertius. Elegies. c. 24 BC, bk. 2.
Sextus Propertius. Elegies, edited and translated by G. P. Goold. Harvard University Press, 1990, bk. 2.
Carus, Titus Lucretius. De Rerum Natura [On the Nature of Things]. c. 55 BC, bk. 1, l. 312.
Carus, Titus Lucretius. The Nature of Things, translated by Alicia Stallings. Penguin Classics, 2007, bk. 1, l. 312.
Carus, Titus Lucretius. De Rerum Natura [On the Nature of Things]. c. 55 BC, bk. 3, l. 784.
Carus, Titus Lucretius. The Nature of Things, translated by Alicia Stallings. Penguin Classics, 2007, bk. 3, l. 784.
Tertullian. Ad Scapulam [To Scapula]. c. 217, ch. 2.
Augustine of Hippo. Confessiones [Confessions]. c. 398, bk. 10, ch. 27.
Augustine of Hippo. Confessions, translated by R. S. Pine-Coffin. Penguin Classics, 1961, bk. 10, ch. 27.
Tacitus. Agricola. c. 98.
Tacitus. "Agricola." Agricola and Germany, translated by Anthony Birley. Oxford University Press, 2009.
Horace. Epistularum liber primus [First Book of Letters]. 20 BC, bk. 1, epistle 11.
Horace. "Epistles." Satires and Epistles, translated by John Davie. Oxford University Press, 2011, bk. 1, epistle 11.
Juvenal. Satirae [Satires]. c. 127, satire 7.
Juvenal. The Satires, translated by Niall Rudd. Oxford University Press, 2008, satire 7.
Tertullian. Adversus Valentinianos [Against the Valentinians]. c. 207 CE, sect. 3.