Note 59 — SELECT THEOREMS IN PROOF OF THE PERPETUITY OF TIME, AND OF THAT WHICH IS NATURALLY MOVED WITH A CIRCULAR MOTION. EXTRACTED FROM THE SECOND BOOK OF PROCLUS ON MOTION.
Thomas Taylor translation
Simple bodies, according to Aristotle, are those which naturally possess an inherent principle of motion. For animals and plants possess a principle of motion; but in these it proceeds from soul and not from nature.