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not all intellectual substances are united to bodies; but some are quite separated from bodies, and these we call angels.
Reply Obj. 1: As was said above (Q. 50, A. 1) it was the opinion of some that every being is a body; and consequently some seem to have thought that there were no incorporeal substances existing except as united to bodies; so much so that some even held that God was the soul of the world, as Augustine tells us (De Civ. Dei vii). As this is contrary to Catholic Faith, which asserts that God is exalted above all things, according to Ps. 8:2: "Thy magnificence is exalted beyond the heavens"; Origen, while refusing to say such a thing of God, followed the above opinion of others regarding the other substances; being deceived here as he was also in many other points, by following the opinions of the ancient philosophers. Bernard's expression can be explained, that the created spirit needs some bodily instrument, which is not naturally united to it, but assumed for some purpose, as will be explained (A. 2). Augustine speaks, not as asserting the fact, but merely using the opinion of the Platonists, who maintained that there are some aerial animals, which they termed demons.
Reply Obj. 2: Gregory calls the angel a rational animal metaphorically, on account of the likeness to the rational nature.
Reply Obj. 3: To give life effectively is a perfection simply speaking; hence it belongs to God, as is said (1 Kings 2:6): "The Lord killeth, and maketh alive." But to give life formally belongs to a substance which is part of some nature, and which has not within itself the full nature of the species. Hence an intellectual substance which is not united to a body is more perfect than one which is united to a body.
SECOND ARTICLE [I, Q. 51, Art. 2]
Whether Angels Assume Bodies?
Objection 1: It would seem that angels do not assume bodies. For there