Rom 15:8

“There are two ways in which "Christ became a servant to the circumcised." First, he was himself circumcised and so identified himself with them. Second, he fulfilled the promises of the law, so that now neither those who are circumcised nor Gentile believers are obliged to keep it any more.”

“Again, he is speaking of Christ's concern for us, still holding to the same topic, and showing what great things He hath done for us, and how "He pleased not Himself." And besides this, there is another point which he makes good, that those of the Gentiles are debtors to a larger amount unto God. And if to a larger amount, then they ought to bear with the weak among the Jews. For since he had spoken very sharply to such, lest this should make these elated, he humbles their unreasonableness, by showing that it was by "promise made to the fathers" that they had the good things given them, while they of the Gentiles had them out of pity and love toward man only. And this is the reason of his saying, "And that the Gentiles might glorify God for his mercy." But that what is said may be made plainer, it is well to listen once more to the words themselves, that you may see what Christ's having been made "a Minister of the circumcision for the truth of God, to confirm the promises made unto the fathers," means. What then is that which is stated? There had been a promise made to Abraham, saying, "Unto thee will I give the earth, and to thy seed, and in thy seed shall all the nations be blessed." But after this, they of the seed of Abraham all became subject to punishment. For the Law wrought wrath unto them by being transgressed, and thenceforward deprived them of that promise made unto the fathers. Therefore the Son came and wrought with the Father, in order that those promises might come true, and have their issue. For having fulfilled the whole Law in which He also fulfilled the circumcision, and having by it, and by the Cross, freed them from the curse of the transgression, He suffered not this promise to fall to the ground. When then he calls Him "a Minister of the circumcision," he means this, that by having come and fulfilled the Law, and been circumcised, and born of the seed of Abraham, He undid the curse, stayed the anger of God, made also those that were to receive the promises fit for them, as being once for all freed from their alienation. To prevent then these accused persons from saying, How then came Christ to be circumcised and to keep the whole Law? he turns their argument to the opposite conclusion. For it was not that the Law might continue, but that He might put an end to it, and free thee from the curse thereof, and set thee entirely at liberty from the dominion of that Law. For it was because thou hadst transgressed the Law, that He fulfilled it, not that thou mightest fulfil it, but that He might confirm to thee the promises made unto the fathers, which the Law had caused to be suspended, by showing thee to have offended, and to be unworthy of the inheritance. And so thou also art saved by grace, since thou wast cast off. Do not thou then bicker, nor perversely cling to the Law at this unsuitable time, since it would have cast thee also out of the promise, unless Christ had suffered so many things for thee. And He did suffer these, not because thou wast deserving of salvation, but that God might be true.”

“Once more Paul urges both Jews and Gentiles to unity with each other. He agrees with the Jews that Christ was promised to them and came to them first and that the Gentiles were called later on, because of God's mercy. Nevertheless, both peoples have now been made into one.”

“Paul said this so that the Gentiles would understand that the Lord Christ had been sent to the Jews and so they would not be proud. Since the Jews rejected what had been sent to them, it happened that the gospel was also preached to the Gentiles, as is most clearly written in the Acts of the apostles, when the apostles say to the Jews: "It was necessary that the Word of God should be spoken first to you. Since you … judge yourselves unworthy … behold, we turn to the Gentiles."It also agrees with the Lord's own testimony, when he said: "I was sent only to the lost sheep of the house of Israel" and: "It is not right for the children's bread to be thrown to the dogs." If the Gentiles think carefully, they will realize by their own faith, by which they now believe that to the pure all things are pure, that they should not offend those Jewish converts who, perhaps from weakness, dare not touch certain kinds of meat, fearing that it has been in contact with idols.”

“He holds to the former subject of discourse, showing that Christ did not please Himself, but accepted everything for our sake, and he persuades the Gentiles not to exalt themselves over those who believed from among the Jews. For the Jews were saved by the promise given to their fathers, while the Gentiles were saved by mercy and love for mankind alone. The meaning of what is said is as follows. To Abraham there was a promise that his seed would inherit the world (Gen. 13:15); but those who descended from Abraham all became deserving of punishment, as transgressors of the law, and therefore unworthy of the promise. Therefore Christ came and fulfilled the law, accepting among other things circumcision as well. Having fulfilled the law, accepted circumcision, and become the seed of Abraham, He extinguished the wrath of God and made us capable of receiving the promise. He accepted circumcision so that the promise of God would not remain in vain, and not in order to establish the law. Why then do you, Judaizer, cling to the law, which has already brought you into such danger that you have been deprived of the promise?”

“Second, when he says, for I say that Christ, he clarifies what he had said: first, with respect to the Jews; second, with respect to the gentiles, at but that the gentiles. First, therefore, he says: it has been stated that Christ welcomed you who are assembled in the unity of faith composed of Jews and gentiles. And this is clear with respect to both: for I say, therefore, that Christ Jesus was minister of the circumcision, for he is the author of everyone's faith, as it says in Hebrews: looking to Jesus, the author and perfecter of our faith (Heb 12:2). But he showed himself in person only to the Jews, as it says in Matthew: I was sent only to the lost sheep of the house of Israel (Matt 15:24); and in Isaiah: his voice will not be heard outside (Isa 42:2). And this for the truth of God, i.e., that the truth of God's promise may be acknowledged: God is truth (Rom 3:4). Hence he continues: to confirm the promises made unto the fathers: he has raised up a horn of salvation for us in the house of his servant David; as he spoke from the mouth of his holy prophets (Luke 1:69); for all the promises of God find their yes in him (2 Cor 1:20).”