Proclus' commentary on Plato's "Timaeus" is perhaps the most important surviving Neoplatonic commentary. In it Proclus contemplates nature's mysterious origins and at the same time employs the deductive rigour required to address perennial philosophical questions. Nature, for him, is both divine and mathematically transparent. He renders theories of Time, Eternity, Providence, Evil, Soul and Intellect and constructs an elaborate ontology that includes mathematics and astronomy. He gives ample play to pagan theology too, frequently lapsing into the arcane language of the "Chaldaean Oracles."...