Latin
Descartes, René. Principia Philosophica [Principles of Philosophy]. Amsterdam: Ludovicum Elzevirium, 1644, pt. 2, sect. 16.
More, Thomas. Libellus vere aureus, nec minus salutaris quam festivus, de optimo rei publicae statu deque nova insula Utopia. Leuven: Self-published, 1516, bk. 2.
More, Thomas. Utopia, edited and translated by Paul Turner. Penguin Classics, 2003, bk. 2.
Bede. Historia ecclesiastica gentis Anglorum [Ecclesiastical History of the English People]. c. 731, bk. 1, ch. 1.
Bede. "Ecclesiastical History of the English People." The Ecclesiastical History of the English People; The Greater Chronicle; Bede's Letter to Egbert, edited by Judith McClure and Roger Collins. Oxford University Press, 2009, bk. 1, ch. 1.
Saint Jerome. Letter to Presbyter Marcus. c. 379, sect. 2.
Horace. Carmina [Odes]. 23 BC, bk. 4, no. 9.
Horace. "Odes." The Complete Odes and Epodes, translated by David West. Oxford University Press, 2008, bk. 4, no. 9.
St. Thomas Aquinas. Collationes in decem praeceptes [Sermons on the Ten Commandments]. c. 1273, prologue.
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. 1, no. 15.
Martial. Epigrams, translated by Gideon Nisbet. Oxford University Press, 2015, bk. 1, no. 15.
Alcuin. Letter to Charlemagne. c. 850.
On Mont Ventoux in Provence, France.
Petrarch. Letter to Dionigi da Borgo San Sepolcro. c. 1336.
Petrarch. "To Dionigi da Borgo San Sepolcro of the Augustinian Order and Professor of Sacred Scripture, concerning some of his personal problems." Letters of Familiar Matters (Rerum Familiarum Libri), translated by Aldo Bernardo. Vol. 1, Italica Press, 2008.
Shakespeare, William. Julius Caesar. The Lord Chamberlain's Men, 1599, Globe Theatre, London, England, UK, act 3, sc. 1.
Shakespeare, William. "Julius Caesar." The Norton Shakespeare, edited by Stephen Greenblatt, et al., 3rd ed., W. W. Norton & Company, 2015, act 3, sc. 1.
Quoted in On Baptism, Against the Donatists, by Augustine of Hippo
Libosus of Vaga. Quoted in De Baptismo Contra Donatistas [On Baptism, Against the Donatists]. c. 400, bk. 3, ch. 6, sect. 9.
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.
Sallust. Bellum Catilinae [War of Catiline]. c. 43–40 BC.
Sallust. "The War with Catiline." The War with Catiline and The War with Jugurtha, translated by John T. Ramsey J. C. Rolfe. Harvard University Press, 2013.
Alberti, Leon Battista. De Pictura [On Painting]. c. 1450, bk. 2.
Alberti, Leon Battista. On Painting, translated by John R. Spencer. Yale University Press, 1966, bk. 2.
Sydenham, Thomas. Observationes Medicae. London, 1676.
Saint Thomas Aquinus. Summa Theologica. c. 1274, pt. 1-2.
Saint Thomas Aquinus. The Summa Theologica of St. Thomas Aquinas, translated by Fathers of the English Dominican Provinc. Christian Classics, 1981, pt. 1-2.