Reply Obj. 2: Since an effect is preserved by its proper cause on which it depends; just as no effect can be its own cause, but can only produce another effect, so no effect can be endowed with the power of self-preservation, but only with the power of preserving another.
Reply Obj. 3: No created nature can be the cause of another, as regards the latter acquiring a new form, or disposition, except by virtue of some change; for the created nature acts always on something presupposed. But after causing the form or disposition in the effect, without any fresh change in the effect, the cause preserves that form or disposition; as in the air, when it is lit up anew, we must allow some change to have taken place, while the preservation of the light is without any further change in the air due to the presence of the source of light. _______________________
THIRD ARTICLE [I, Q. 104, Art. 3]
Whether God Can Annihilate Anything?
Objection 1: It would seem that God cannot annihilate anything. For Augustine says (QQ. 83, qu. 21) that "God is not the cause of anything tending to non-existence." But He would be such a cause if He were to annihilate anything. Therefore He cannot annihilate anything.
Obj. 2: Further, by His goodness God is the cause why things exist, since, as Augustine says (De Doctr. Christ. i, 32): "Because God is good, we exist." But God cannot cease to be good. Therefore He cannot cause things to cease to exist; which would be the case were He to annihilate anything.
Obj. 3: Further, if God were to annihilate anything it would be by His action. But this cannot be; because the term of every action is existence. Hence even the action of a corrupting cause has its term in something generated; for when one thing is generated another undergoes corruption. Therefore God cannot annihilate anything.
On the contrary, It is written (Jer. 10:24): "Correct me, O Lord, but yet with judgment; and not in Thy fury, lest Thou bring me to nothing."
I answer that, Some have held that God, in giving existence to creatures, acted from natural necessity. Were this true, God could not annihilate anything, since His nature cannot change. But, as we have said above (Q. 19, A. 4), such an opinion is entirely false, and absolutely contrary to the Catholic faith, which confesses that God created things of His own free-will, according to Ps. 134:6: "Whatsoever the Lord pleased, He hath done." Therefore that God gives existence to a creature depends on His will; nor does He preserve things in existence otherwise than by continually pouring out existence into them, as we have said. Therefore, just as before things existed, God was free not to give them existence, and not to make them; so after they are made, He is free not to continue their existence; and thus they would cease to exist; and this would be to annihilate them.
Reply Obj. 1: Non-existence has no direct cause; for nothing is a cause except inasmuch as it has existence, and a being essentially as such is a cause of something existing. Therefore God cannot cause a thing to tend to non-existence, whereas a creature has this tendency of itself, since it is produced from nothing. But indirectly God can be the cause of things being reduced to non-existence, by withdrawing His action therefrom.