1. Homer, Books VI, IX, XXII; Odyssey Book XIII
2. Plato, Book IV; ; Protagoras
3. Aristotle, Books II–VI
4. Epictetus, Books I–II;
5. Augustine, Book XIX, Chapter 4
6. Aquinas, I-II, Questions 55–67
7. Machiavelli, , Chapters 15–19; Book III
8. Hume, , Book III, Part III
9. Kant, , Doctrine of Virtue
10. Mill, , Chapter IV