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References
- ↑ http://faculty.cua.edu/hoffmann/courses/201_1068/Plato [ dead link ]
- ↑ Aristotle, De Anima, Bk. III, ch. 5 (430a10-25).
- ↑ Plotinus at the Internet Encyclopedia of Philosophy Retrieved on May 15, 2009
- ↑ Compendium Theologiae Retrieved on May 15, 2009