Roman Empire
Aurelius, Marcus. Meditations. c. 180, bk. 6.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 6.
Aurelius, Marcus. Meditations. c. 180, bk. 2.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 2.
Horace. Carmina [Odes]. 23 BC, bk. 4, no. 2.
Horace. "Odes." The Complete Odes and Epodes, translated by David West. Oxford University Press, 2008, bk. 4, no. 2.
Aurelius, Marcus. Meditations. c. 180, bk. 2.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 2.
Plutarch. "Agesilaus." Βίοι Παράλληλοι [Parallel Lives]. c. 2nd century.
Plutarch. "Agesilaus." Roman Lives: A Selection of Eight Roman Lives, translated by Robin Waterfield. Oxford University Press, 2009.
Aurelius, Marcus. Meditations. c. 180, bk. 4.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 4.
Said by gladiators saluting the Roman Emperor prior to combat.
Bion. Quoted in The Lives and Opinions of Eminent Philosophers, written by Diogenes Laërtius. c. 240 AD, bk. 4, ch. 7, sect. 50.
Bion. Quoted in The Lives of Eminent Philosophers, written by Diogenes Laërtius, translated by Pamela Mensch, edited by James Miller. Oxford University Press, 2018, bk. 4, ch. 7, sect. 50.
Ovid. Amores. c. 16 BC, bk. 1, no. 9.
Ovid. "Amores." The Love Poems, translated by A. D. Melville. Oxford University Press, 2008, bk. 1, no. 9.
Aurelius, Marcus. Meditations. c. 180, bk. 4.
Aurelius, Marcus. Meditations, edited and translated by Martin Hammond. Penguin Classics, 2015, bk. 4.
Quoted in Lives of the Caesars, by Suetonius
Accius, Lucius. Atreus. c. 86 BC, Rome, Italy.
Horace. Carmina [Odes]. 23 BC, bk. 3, no. 2.
Horace. "Odes." The Complete Odes and Epodes, translated by David West. Oxford University Press, 2008, bk. 3, no. 2.
The Holy Bible: The King James Version. 1611. (John 16:33).
Saint Jerome. Letter to Heliodorus. c. 374.
Saint Jerome. The Letters of Saint Jerome. Aeterna Press, 2016.
Horace. Epistularum liber primus [First Book of Letters]. 20 BC, bk. 1, epistle 10.
Horace. "Epistles." Satires and Epistles, translated by John Davie. Oxford University Press, 2011, bk. 1, epistle 10.
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.
Martial. Epigrammata [Epigrams]. c. 102 AD, bk. 3, no. 42.
Martial. Epigrams, translated by Gideon Nisbet. Oxford University Press, 2015, bk. 3, no. 42.