1. Plato, , Books IV-VII; Apology; , Book III
2. Aristotle, , Book VI; , Books I, XII
3. Augustine, , Books VIII, XI, XIX; , Books VII, X
4. Aquinas, , I-II, Q. 57; II-II, Q. 45-46
5. Montaigne, , "Of Pedantry," "Of Experience"
6. Descartes, ;
7. Spinoza, , Part V
8. Kant, , Preface and Introduction;
9. Hegel, , Introduction