God’s Work In Creatures is Quasi-Natural

Augustine’s words quoted in the gloss mean, not that God is unable to do otherwise than nature does, since his works are often contrary to the wonted course of nature; but that whatever he does in things is not contrary to nature, but is nature in them, forasmuch as he is the author and controller of nature. Thus in the physical order we observe that when an inferior body is moved by a higher, the movement is natural to it, although it may not seem in keeping with the movement which it has by reason of its own nature: thus the tidal movement of the sea is caused by the moon; and this movement is natural to it as the Commentator observes (De coelo et mundo, iii, comm. 20), although water of itself has naturally a downward movement. Thus in all creatures, what God does in them is quasi-natural (quasi pro naturali) to them. Wherefore we distinguish in them a twofold potentiality: a natural potentiality in respect of their proper operations and movements, and another, which we call obediential, in respect of what is done in them by God. (Thomas Aquinas, De potentia, q. 1, a. 3, ad 1.)