Römer 15:9

that the Gentiles might glorify God for his mercy--A number of quotations from the Old Testament here follow, to show that God's plan of mercy embraced, from the first, the Gentiles along with the Jews. as it is written-- (Psa 18:49). I will confess to--that is, glorify thee among the Gentiles.

The apostle, in this chapter, continues the discourse of the former, concerning mutual forbearance in indifferent things; and so draws towards a conclusion of the epistle. Where such differences of apprehension, and consequently distances of affection, are among Christians, there is need of precept upon precept, line upon line, to allay the heat, and to beget a better temper. The apostle, being desirous to drive the nail home, as a nail in a sure place, follows his blow, unwilling to leave the subject till he has some hopes of prevailing, to which end he orders the cause before them and fills his mouth with the most pressing arguments. We may observe, in this chapter, I. His precepts to them. II. His prayers for them. III. His apology for writing to them. IV. His account of himself and his own affairs. V. His declaration of his purpose to come and see them. VI. His desire of a share in their prayers.

15:9-12 These quotations from the Old Testament all emphasize God’s promise that Gentiles would join with Jews in praising God. Gentiles are now full members of God’s people.