Therefore, he says, receive one another, just as Christ also received you, to the glory of God. Let us receive one another, preferring to be of one mind, bearing one another's burdens (Gal 6:2), and preserving the unity of the Spirit in the bond of peace (Eph 4:3).
Thus God received us in Christ. True is the one who said that the world was so loved by God and the Father that the very Son was given for us (cf. Jn 3:16). For He was given as a ransom for the life of all. We received the price paid for death, and we were redeemed from death and sin.
The Apostle makes clear the purpose of the divine economy, saying: Christ became a minister to the circumcised for the sake of the truth, and so on. Since God had promised the fathers of the Jews that He would bless the seed that would come from them, as numerous as the stars of heaven (Heb 11:12), the Word appeared in the flesh and became man, being God. Yet He Himself upholds all creation and, as God, grants well-being to all that exists.
He came into this world with flesh, yet not to be served, as He Himself says, but to serve and to give His soul for the redemption of many (Mt 20:28). He also clearly confessed that He had come to fulfill the promise given to Israel, for He said: "I was sent only to the lost sheep of the house of Israel" (Mt 15:24).
Therefore Paul would not lie when he says that He became a minister to the circumcised, in order to fulfill what had been promised to the fathers. Besides this, He was appointed by God and the Father for mercy to the Gentiles, so that they too might glorify the Savior and Redeemer as the Cause of being and the Maker of all.
It was necessary, indeed necessary, since the circumcised, through much disobedience, impiously insulted Him and did not accept the redemption offered by Him, that the ineffable grace of God should not appear inactive. Only very few from Israel were saved and believed.
Therefore the brightness from on high was, as it were, spread over all, and the Gentiles were received. Thus it is seen that the mystery of wisdom in Christ did not depart from its purpose directed toward meekness. By the mercy of God, instead of those who stumbled, the whole world under heaven was saved.
That the mystery had been foretold by the voice of the saints who foresaw the future in the Spirit, he shows most clearly by setting forth the prophecies. In the following verses (Rom 15:9-12), the Apostle cites a series of Old Testament prophecies concerning the coming salvation of the Gentiles: Ps 17:50, which is 2 Sam 22:50; Deut 32:43; Ps 116:1; and Is 11:10.