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shown above (Q. 3, A. 4). From this it is clear that God alone exists of His own essence: while all other things have their existence by participation. Now whatever exists by participation is caused by what exists essentially; as everything ignited is caused by fire. Consequently the angels, of necessity, were made by God.
Reply Obj. 1: Augustine says (De Civ. Dei xi, 50) that the angels were not passed over in that account of the first creation of things, but are designated by the name "heavens" or of "light." And they were either passed over, or else designated by the names of corporeal things, because Moses was addressing an uncultured people, as yet incapable of understanding an incorporeal nature; and if it had been divulged that there were creatures existing beyond corporeal nature, it would have proved to them an occasion of idolatry, to which they were inclined, and from which Moses especially meant to safeguard them.
Reply Obj. 2: Substances that are subsisting forms have no 'formal' cause of their existence and unity, nor such active cause as produces its effect by changing the matter from a state of potentiality to actuality; but they have a cause productive of their entire substance.
From this the solution of the third difficulty is manifest.
SECOND ARTICLE [I, Q. 61, Art. 2]
Whether the Angel Was Produced by God from Eternity?
Objection 1: It would seem that the angel was produced by God from eternity. For God is the cause of the angel by His being: for He does not act through something besides His essence. But His being is eternal. Therefore He produced the angels from eternity.
Obj. 2: Further, everything which exists at one period and not at another, is subject to time. But the angel is above time, as is laid down in the book _De Causis._ Therefore the angel is not at one time existing