HKB
Whether the Foreknowledge of Merits Is the Cause of Predestination?
Objection 1: It seems that foreknowledge of merits is the cause of predestination. For the Apostle says (Rom. 8:29): "Whom He foreknew, He also predestined." Again a gloss of Ambrose on Rom. 9:15: "I will have mercy upon whom I will have mercy" says: "I will give mercy to him who, I foresee, will turn to Me with his whole heart." Therefore it seems the foreknowledge of merits is the cause of predestination.
Obj. 2: Further, Divine predestination includes the divine will, which by no means can be irrational; since predestination is "the purpose to have mercy," as Augustine says (De Praed. Sanct. ii, 17). But there can be no other reason for predestination than the foreknowledge of merits. Therefore it must be the cause of reason of predestination.
Obj. 3: Further, "There is no injustice in God" (Rom. 9:14). Now it would seem unjust that unequal things be given to equals. But all men are equal as regards both nature and original sin; and inequality in them arises from the merits or demerits of their actions. Therefore God does not prepare unequal things for men by predestinating and reprobating, unless through the foreknowledge of their merits and demerits.
On the contrary, The Apostle says (Titus 3:5): "Not by works of justice which we have done, but according to His mercy He saved us." But as He saved us, so He predestined that we should be saved. Therefore, foreknowledge of merits is not the cause or reason of predestination.
I answer that, Since predestination includes will, as was said above (A. 4), the reason of predestination must be sought for in the same way as was the reason of the will of God. Now it was shown above (Q. 19, A. 5), that we cannot assign any cause of the divine will on the part of the act of willing; but a reason can be found on the part of the things willed; inasmuch as God wills one thing on account of something else. Wherefore nobody has been so insane as to say that merit is the cause of divine predestination as regards the act of the predestinator. But this is the question, whether, as regards the effect, predestination has any cause; or what comes to the same thing, whether God pre-ordained that He would give the effect of predestination to anyone on account of any merits.
Accordingly there were some who held that the effect of predestination was pre-ordained for some on account of pre-existing merits in a former life. This was the opinion of Origen, who thought that the souls of men were created in the beginning, and according to the diversity of their works different states were assigned to them in this world when united with the body. The Apostle, however, rebuts this opinion where he says (Rom. 9:11,12): "For when they were not yet born, nor had done any good or evil . . . not of works, but of Him that calleth, it was said of her: The elder shall serve the younger."
Others said that pre-existing merits in this life are the reason and cause of the effect of predestination. For the Pelagians taught that the beginning of doing well came from us; and the consummation from God: so that it came about that the effect of predestination was granted to one, and not to another, because the one made a beginning by preparing, whereas the other did not. But against this we have the saying of the Apostle (2 Cor. 3:5), that "we are not sufficient to think anything of ourselves as of ourselves." Now no principle of action can be imagined previous to the act of thinking. Wherefore it cannot be said that anything begun in us can be the reason of the effect of predestination.