Proclus Diadochus on the Theology of Plato
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This is the only translation of Proclus masterwork Platonic Theology, consisting of six books plus one added by Thomas Taylor. It is the main work of Proclus and should be studied together with his commentaries on the Timaeus and Parmenides. Its depth can be hardly overrated and you may need to study some textbooks on Proclus such as Lucas Siorvanes "Neo-Platonic Philosophy and science".