Latin
Bernard of Clairvaux. "Letter CVI: To Magister Henry Murdach." Epistles. n.d., no. CCCLXXI.
Bernard of Clairvaux. "Letter CVI: To Magister Henry Murdach." The Letters of Bernard Clairvaux, translated by Bruno Scott James. Liturgical Press, 2003.
Saint Cyprian. Letter to Jubaianus, Concerning the Baptism of Heretics. c. 250.
Saint Cyprian. "Letter 73: Rebaptism: the Novatian Dimension." On the Church: Select Letters, translated by Allen Brent. St. Vladimir's Seminary Press, 2006.
Justinian. "Institutiones Justinani [Institutes of Justinian]." Corpus Iurus Civilis [Body of Civil Law]. c. 533, b. 1, ch. 1, para. 1.
Justinian. Justinian's Institutes, translated by Peter Birks and Grant McLeod. Cornell University Press, 1987, bk. 1, ch. 1, para. 1.
Juvenal. Satirae [Satires]. c. 127, satire 8.
Juvenal. The Satires, translated by Niall Rudd. Oxford University Press, 2008, satire 8.
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.
Juvenal. Satirae [Satires]. c. 127, satire 6.
Juvenal. The Satires, translated by Niall Rudd. Oxford University Press, 2008, satire 6.
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. 7, no. 73.
Martial. Epigrams, translated by Gideon Nisbet. Oxford University Press, 2015, bk. 7, no. 73.
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.
Boethius. De Consolatione Philosophiae [On the Consolation of Philosophy]. 524, bk. 2, poem 4.
Boethius. The Consolation of Philosophy, translated by Victor Watts. Penguin Classics, 1999, bk. 2, poem 4.
Horace. Epistularum liber secundus [Second Book of Letters]. 14 BC, bk. 2, epistle 2.
Horace. "Epistles." Satires and Epistles, translated by John Davie. Oxford University Press, 2011, bk. 2, epistle 2.