1. Plato, ; ; ; Books VI–VII
2. Aristotle, Books VII–VIII, XII; Book II
3. Plotinus, , V.8–9; VI.7
4. Augustine, XII; VIII
5. Aquinas, I, QQ. 15, 75–76;
6. Descartes, ;
7. Locke, , Book III
8. Leibniz, ;
9. Kant, , Transcendental Aesthetic and Analytic
10. Hegel, , Doctrine of Essence
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