(CG 3/66). That nothing gives Being except in as much as it acts in the ... (Book 3. God, the End of Creatures) (Summa Contra Gentiles) (Aquinas, Thomas, St.)

AS God not only gave being to things when they first began to be, but also causes being in them so long as they exist (Chap. LXV); so He did not once for all furnish them with active powers, but continually causes those powers in them, so that, if the divine influx were to cease, all activity would cease.

Hence it is said: You have wrought all our works in us, O Lord (Isa. xxvi, 12). And for this reason frequently in the Scriptures the effects of nature are put down to the working of God, because He it is that works in every agent, physical or voluntary: e.g., Have you not drawn me out like milk, and curdled me like cheese? with skin and flesh you have clothed me, with bones and sinews you have put me together (Job x, 10, 11).