John Chrysostom
The Apostle, holding to the former subject of the discourse, again speaks about Christ's care and shows how much He did for us and how He did not please Himself. At the same time he also proves that believers from the Gentiles are the greatest debtors to God. If they are most indebted, then their duty is to bear the weak among the Jews. Since the Apostle had struck the latter a strong blow, he now humbles the pride of the former so that they not become arrogant. He proves that blessings were given to the Jews according to the promise made to their fathers. But to those called from the Gentiles, they were given by mercy and love for mankind alone. Therefore he says: "and to the Gentiles, out of mercy, to glorify God" (Rom 15:9).
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But so that what has been said may be clearer to you, hear the Apostle's words again. Then you will understand what the expression means: Christ, for the sake of the truth of God, became a minister of circumcision, to fulfill the promises made to the fathers. What, then, is meant here? The promise given to Abraham was contained in these words: "To thee I will give the land, and to thy seed" (Gen 13:15), and: "In thy seed all the nations shall be blessed" (Gen 22:18). But afterward all who came from Abraham's seed became worthy of punishment. The transgression of the law brought wrath upon them and finally deprived them of the promise given to the fathers. Therefore the Son, when He came to earth, cooperated with the Father to justify these promises and bring them to fulfillment. He fulfilled the whole law, including circumcision. By this fulfillment of the law, and also through the Cross, He freed men from the curse for transgressing the law. Thus He did not allow the promise to fall. Therefore, when the Apostle calls Jesus Christ a minister of circumcision, he means that by His coming, by fulfilling the whole law, by accepting circumcision, and by becoming Abraham's seed, He removed the curse. He delivered men from the wrath of God. Finally, He made those who were ready to receive the promise capable of receiving it, and once for all freed them from stumbling blocks. So that those accused might not say, "How then was Christ Himself circumcised and how did He keep the whole law?" the Apostle draws the opposite conclusion from this. Christ fulfilled this, he says, not so that the law might remain in force, but so that He might abolish it. He did this to deliver you from the curse lying upon you and to free you completely from the dominion of the law. Because you transgressed the law, Christ fulfilled it not so that you too should fulfill it, but to secure for you the promises given to the fathers. The law had destroyed these promises for you, showing that you had transgressed it and were unworthy of the inheritance. Thus you too are saved by grace, because you had first been rejected. Therefore do not object, and do not stubbornly cling to the law out of season. It would have deprived you even of the promise if Christ had not suffered so much for you. He suffered so much not because you were worthy of salvation, but to show God's faithfulness. Then, so that the one called from the Gentiles might not become proud over this, the Apostle continues: Rom 15:9. "And to the Gentiles, out of mercy, to glorify God."