If then faith was able to do what was contrary to nature, much more will it that which is according to nature. For if this person, who was cut off from those by nature his fathers, came contrary to nature unto Abraham, much more will you be able to recover your own. For the Gentile's evil lot is according to nature (he being by nature a wild olive), and the good contrary to nature (it being contrary to nature for him to be grafted into Abraham), but your lot on the contrary is the good by nature. For it is not upon another root, as the Gentile, but on your own that you are to be fixed if you are minded to come back. What then do you deserve, when after the Gentile had been able to do what was contrary to nature, you are not able to do that which is according to nature, but hast given up even this? Then as he had said “contrary to nature,” and, “were grafted in,” that you may not suppose the Jew to have the advantage, he again corrects this by saying that he also is grafted in. “How much more shall these,” says he, “which be the natural branches be grafted into their own olive-tree?” And again, “God is able to graft them in.” And before this he says, that if they “abide not still in unbelief, they shall be also grafted in.” And when you hear that he keeps speaking of “according to nature,” and “contrary to nature,” do not suppose that he means the nature that is unchangeable, but he tells us in these words of the probable and the consecutive, and on the other hand of the improbable. For the good things and the bad are not such as are by nature, but by temper and determination alone. And consider also how inoffensive he is. For after saying that thou also will be cut off, if you dost not abide in the faith, and these will be grafted in, if they “abide not still in unbelief,” he leaves that of harsh aspect, and insists on that of kindlier sound, and in it he ends, putting great hopes before the Jews if they were minded not to abide so. Wherefore he goes on to say,
Ver. 25. “For I would not, brethren, that you should be ignorant of this mystery, lest ye should be wise your own conceits.”
Meaning by mystery here, that which is unknown and unutterable, and has much of wonder and much of what one should not expect about it. As in another passage too he says, “Behold, I tell you a mystery. We shall not all sleep, but we shall all be changed.” What then is the mystery?
“That blindness in part has happened unto Israel.” Here again he levels a blow at the Jew, while seeming to take down the Gentile. But his meaning is nearly this, and he had said it before, that the unbelief is not universal, but only “in part.” As when he says, “But if any has caused grief, he has not grieved me, but in part”: And, so here too he says what he had said above, “God has not cast off His people whom He foreknew”: and again, “What then? Have they stumbled that they should fall? God forbid”: This then he says here also; that it is not the whole people that is pulled up, but many have already believed, and more are likely to believe. Then as he had promised a great thing, he adduces the prophet in evidence, speaking as follows. Now it is not for the fact of a blindness having happened that he quotes the passage (for every one could see that), but that they shall believe and be saved, he brings Isaiah to witness, who cries aloud and says,
Ver. 26. “There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob.”
Then to give the mark that fixes its sense to salvation, to prevent any one from drawing it aside and attaching it to times gone by, he says,
Ver. 27. “For this is my covenant unto them, when I shall take away their sins.”
Not when they are circumcised, not when they sacrifice, not when they do the other deeds of the Law, but when they attain to the forgiveness of sins. If then this has been promised, but has never yet happened in their case, nor have they ever enjoyed the remission of sins by baptism, certainly it will come to pass. Hence he proceeds,
Ver. 29. “For the gifts and calling of God are without repentance.”
And even this is not all he says to solace them, for he uses what had already come about. And what came in of consequence, that he states as chiefly intended, putting it in these words,
Ver. 28. “As concerning the Gospel, they are enemies for your sakes: but as touching the election, they are beloved for the fathers' sakes.”
That the Gentile then might not be puffed up, and say, “I am standing, do not tell me of what would have been, but what has been,” he uses this consideration to bring him down, and says, “As concerning the Gospel, they are enemies for your sakes.” For when you were called they became more captious. Nevertheless God has not even now cut short the calling of you, but He waits for all the Gentiles that are to believe to come in, and then they also shall come. Then he does them another kind favor, by saying, “As touching election, they are beloved for the fathers sakes.” And what is this? For wherein they are enemies, punishment is theirs: but wherein they are beloved, the virtue of their ancestors has no influence on them, if they do not believe. Nevertheless, as I said, he ceases not to solace them with words, that he may bring them over. Wherefore by way of fresh proof for his former assertion, he says,
Ver. 30-32. “For as you in times past have not believed God, yet have now obtained mercy through their unbelief; even so have these also now not believed, that through your mercy they may also obtain mercy. For God has concluded them all in unbelief, that He might have mercy upon all.”
He shows here that those of the Gentiles were called first. Then, as they would not come, the Jews were elected, and the same result occurred again. For when the Jews would not believe, again the Gentiles were brought over. And he does not stop here, nor does he draw the whole to a conclusion at their rejection, but at their having mercy shown them again. See how much he gives to those of the Gentiles, as much as he did to the Jews before. For when you, he would say, “in times past did not obey,” being of the Gentiles, then the Jews came in. Again, when these did not obey, you have come. However, they will not perish forever. “For God has concluded them all in unbelief,” that is, has convinced them, has shown them disobedient; not that they may remain in disobedience, but that He may save the one by the captiousness of the other, these by those and those by these. Now consider; you were disobedient, and they were saved. Again, they have been disobedient, and you have been saved. Yet you have not been so saved as to be put away again, as the Jews were, but so as to draw them over through jealousy while you abide.
Ver. 33. “Oh, the depth of the riches, both of the wisdom and knowledge of God! How unsearchable are His judgments!”
Source: Homilies on Romans (New Advent)