Reply Obj. 2: The reason of the quantity of any one part must be judged from the proportion of that part of the whole. Thus in God the reason why He has made so many stars, or so many species of things, or predestined so many, is according to the proportion of the principal parts to the good of the whole universe.
Reply Obj. 3: The good that is proportionate to the common state of nature is to be found in the majority; and is wanting in the minority. The good that exceeds the common state of nature is to be found in the minority, and is wanting in the majority. Thus it is clear that the majority of men have a sufficient knowledge for the guidance of life; and those who have not this knowledge are said to be half-witted or foolish; but they who attain to a profound knowledge of things intelligible are a very small minority in respect to the rest. Since their eternal happiness, consisting in the vision of God, exceeds the common state of nature, and especially in so far as this is deprived of grace through the corruption of original sin, those who are saved are in the minority. In this especially, however, appears the mercy of God, that He has chosen some for that salvation, from which very many in accordance with the common course and tendency of nature fall short. _______________________
EIGHTH ARTICLE [I, Q. 23, Art. 8]
Whether Predestination Can Be Furthered by the Prayers of the Saints?
Objection 1: It seems that predestination cannot be furthered by the prayers of the saints. For nothing eternal can be preceded by anything temporal; and in consequence nothing temporal can help towards making something else eternal. But predestination is eternal. Therefore, since the prayers of the saints are temporal, they cannot so help as to cause anyone to become predestined. Predestination therefore is not furthered by the prayers of the saints.
Obj. 2: Further, as there is no need of advice except on account of defective knowledge, so there is no need of help except through defective power. But neither of these things can be said of God when He predestines. Whence it is said: "Who hath helped the Spirit of the Lord? [*Vulg.: 'Who hath known the mind of the Lord?'] Or who hath been His counsellor?" (Rom. 11:34). Therefore predestination cannot be furthered by the prayers of the saints.
Obj. 3: Further, if a thing can be helped, it can also be hindered. But predestination cannot be hindered by anything. Therefore it cannot be furthered by anything.
On the contrary, It is said that "Isaac besought the Lord for his wife because she was barren; and He heard him and made Rebecca to conceive" (Gen. 25:21). But from that conception Jacob was born, and he was predestined. Now his predestination would not have happened if he had never been born. Therefore predestination can be furthered by the prayers of the saints.
I answer that, Concerning this question, there were different errors. Some, regarding the certainty of divine predestination, said that prayers were superfluous, as also anything else done to attain salvation; because whether these things were done or not, the predestined would attain, and the reprobate would not attain, eternal salvation. But against this opinion are all the warnings of Holy Scripture, exhorting us to prayer and other good works.
Others declared that the divine predestination was altered through prayer. This is stated to have the opinion of the Egyptians, who thought that the divine ordination, which they called fate, could be frustrated by certain sacrifices and prayers. Against this also is the authority of Scripture. For it is said: "But the triumpher in Israel will not spare and will not be moved to repentance" (1 Kings 15:29); and that "the gifts and the calling of God are without repentance" (Rom. 11:29).