Here he wishes to accomplish two tasks: first, to console the Jews, and second, to curb the pride of the Gentiles. He says: salvation became the possession of the Gentiles when the Jews stumbled and did not believe. In order, the Jews should have been saved first, and then the Gentiles; but since the Jews proved to be unbelieving, the Gentiles were chosen. This is also indicated in many places in the Gospel. And the Gentiles were saved "to provoke them to jealousy," that is, so that the Jews would be stung by the honor shown to the Gentiles and would be persuaded to come to Christ, at least out of rivalry with them.
Rom. 11:12. Now if their fall is the riches of the world, and their diminishing the riches of the Gentiles, how much more their fullness.
If, he says, the Jews, having stumbled, prepared salvation for the Gentiles, and the Gentiles were accepted when the Jews were rejected, and the fall of the Jews became the riches of the Gentiles, then how much more their "fullness," that is, when they, having turned back, shall all be saved. He says this to please the Jews and to console them. For although the Jews fell, the Gentiles would not have been saved if they had not had faith.
Rom. 11:13. I speak to you, Gentiles. Inasmuch as I am the Apostle of the Gentiles, I glorify my ministry.
Rom. 11:14. If by any means I may provoke to jealousy my kinsmen according to the flesh and save some of them.
Again consoling the Jews, he humbles the pride of the Gentiles, saying: I commend you for two reasons: first, because having been appointed as a teacher to you, I have need to glorify "my ministry," that is, you; and second, because I have in view to provoke to jealousy "my kinsmen according to the flesh" — the Jews. By the word "flesh" he showed his kinship with the Jews and his tender love for them. "And might not save" — he did not say: all, but: "some of them." For he subtly reveals their hardheartedness; because it could happen that some, being kindled by emulation, would imitate the Gentiles and believe.
Rom. 11:15. If their rejection is the reconciliation of the world, what will their acceptance be but life from the dead?
If, he says, having been angered at them, He granted so much to others and made enemies into friends, what will He not grant when He receives them? Then there will be "life from the dead," that is, unending blessings; for He indicates these by the word "life." At the same time, he also hints at something more exalted, namely that just as the resurrection from the dead will not depend on the acceptance of the Jews, so too the salvation of others will not depend on them either, if they do not have faith. All of this he says seemingly in favor of the Jews, offering them a refreshing drink, as physicians often do with the gravely ill.
Rom. 11:16. If the firstfruit is holy, then the whole is also; and if the root is holy, then the branches are also.
He calls the patriarchs the "firstfruit" and the "root," and those of their descendants who believed the "lump" and the "branches." So he comforts the unbelieving Jews, saying: you too will be holy if you believe. For it is necessary that the lump and the branches be like the firstfruit — that is, the former like the firstfruit, and the latter like the root. But if you have not become like them, this is a sign of great wickedness.
Rom. 11:17. If some of the branches were broken off, and you, being a wild olive tree, were grafted in among them and became a partaker of the root and fatness of the olive tree,
Rom. 11:18. then do not boast against the branches.
He called the unbelieving Jews broken-off branches, for they became unworthy of the holy root. And he well said "were broken off," for God never rejected them in this way, although they sinned in many ways. And in place of them, the broken off, you, the Gentile, he says, were grafted in. He did not say "you were planted," but "you were grafted in," and by this he stings the Jew and shows that the Gentile stands on the tree of the Jew, that is, on the patriarchs, and "became a partaker of the root and the sap," that is, attained from God the same nobility and glory as the Jews. Therefore, do not be arrogant and do not boast against the branches.
Rom. 11:18. If you exalt yourself, then remember that it is not you who supports the root, but the root that supports you.
What good is this to the branches that were broken off? For it is the root that supports. Do you see how he only praises the Jews in appearance, seeking merely to console them? However, even by this he spurs the Jews to zeal, showing the harm they have suffered and how others have received their possession and hold it.
Rom. 11:19. You will say: "The branches were broken off so that I might be grafted in."
Rom. 11:20. Well said. They were broken off because of unbelief, and you stand by faith: do not be haughty, but fear.
Here he proves that the Gentiles were not chosen in place of the Jews because the Jews sinned, but for the faith which the Gentiles displayed. So where he seems to cast down the Gentile, there he shows that the fall of the Jews was inexcusable. But he corrects both groups. You, Gentile, will say that the branches were broken off so that you might be grafted in? Yes, they were broken off, but by their own unbelief, and not because God owed you that honor: for "you stand by faith," having been grafted into the root. Therefore "be afraid," because the grafting in is not a matter of nature, but of faith.
Rom. 11:21. If God did not spare the natural branches, take heed, lest He not spare you either.
The Jews were sons of the patriarchs by nature, yet were broken off by unbelief. All the more should you fear, you who are grafted in, whether God will spare you in the case of your fall.
Rom. 11:22. So then behold the goodness and severity of God: severity toward those who fell, but goodness toward you, if you continue in the goodness of God; otherwise you too will be cut off.
Rom. 11:23. But they also, if they do not continue in unbelief, will be grafted in, for God is able to graft them in again.
He did not say: "you see" your own merit, but: "the goodness of God"; for all is the work of God's grace. And endeavor to continue — he did not say: in faith, but: "in goodness," that is, to the end of your life do what is worthy of God's love for mankind. If you do not act thus, you will be cut off. So too the Jews would have been grafted in, if they had not continued to remain in unbelief; for God did not first cut them off, but they themselves fell away of their own accord and were cut off by their unbelief. In saying that "God did not spare," he means that God does not show mercy to the Jews, but considers them unworthy of communion and fellowship with the holy forefathers. Most wisely Paul frightens the Gentile by what happened to the Jews, while to the Jew, by the example of what happened to the Gentiles, he inspires the boldness to be grafted in by faith and encourages him with hope in the power of God. God is able, he says, to graft them in; He does all things that surpass our hopes.
Rom. 11:24. For if you were cut off from the olive tree which is wild by nature, and were grafted contrary to nature into a cultivated olive tree, how much more shall these, who are natural branches, be grafted into their own olive tree.
If, he reasons, if you, a Gentile, to whom evil is akin by nature and who has ancestors resembling a wild olive tree, were cut off from them by faith, and, what was not in your nature, were grafted into the good olive tree, that is, into the patriarchs, then how much more will the Jew, to whom good is akin by nature, be returned to his own olive tree, that is, to his own fathers? And when you hear Paul say "by nature," understand it as: naturally and logically — for example: it was natural that the son of holy Abraham would be holy. Conversely, the expression "not by nature" should be understood as: unnaturally and illogically — for example: it is unnatural that the son of a vile pagan would be holy.