 Aquinas, Thomas |  Aristotle |  Aristotle, General Topics: metaphysics |  Augustine, Saint |  binarium famosissimum [= most famous pair] |  Cusanus, Nicolaus [Nicolas of Cusa] |  Dietrich of Freiberg |  free will |  Ibn Sina [Avicenna] |  Meister Eckhart |  properties |  Pseudo-Dionysius the Areopagite |  soul, ancient theories of |  substance 