Simplicius 
Simplicius: On Aristotle On the Heavens 1.10-12 [PDF ebook] 

In the three chapters of
On the Heavens dealt with in this volume, Aristotle argues that the universe is ungenerated and indestructible. In Simplicius» commentary, translated here, we see a battle royal between the Neoplatonist Simplicius and the Aristotelian Alexander, whose lost commentary on Aristotle»s
On the Heavens Simplicius partly preserves. Simplicius» rival, the Christian Philoponus, had conducted a parallel battle in his
Against Proclus but had taken the side of Alexander against Proclus and other Platonists, arguing that Plato»s
Timaeus gives a beginning to the universe. Simplicius takes the Platonist side, denying that Plato intended a beginning. The origin to which Plato refers is, according to Simplicius, not a temporal origin, but the divine cause that produces the world without beginning.