Rom 9:26

“"For even they shall be called," he says, "the children of the living God." But if they should assert that this was said of those of the Jews who believed, even then the argument stands. For if with those who after so many benefits were hard-hearted and estranged, and had lost their being as a people, so great a change was wrought, what is there to prevent even those who were not estranged after being taken to Him, but were originally aliens, from being called, and, provided they obey, from being counted worthy of the same blessings?”

“And even, what is more important, sons of the living God. If someone should say that this was spoken about the Jews who had conducted themselves ungratefully but were afterwards received into grace, such an argument does not harm our explanation. For if this acceptance happened with them, what prevented it from happening with the Gentiles?”

“Then, when he says and it shall be in the place, he cites another text from Hosea in which they are promised the dignity of being sons of God (Hos 1:10), about which the Jews boasted because, as it says in Isaiah: sons have I reared and brought up (Isa 1:2) and in Deuteronomy: is he not your father? (Deut 32:6). For the gentiles not only were not called sons, which applies to those who serve God out of love and are led by the Spirit of God (Rom 8:14); they were not even worthy to be called the people of God, which could apply at least to those who had received the spirit of servitude in fear. Hence, he says, and it shall be in the place, i.e., in Judea, where it was said unto them, i.e., to the gentiles by the Jews speaking as though in God's person: you are not my people, because they did not consider them God's people, there, i.e., even among the believing Jews, they shall be called the sons of the living God. Or in the place, i.e., in the entire world where they will be converted to the faith. This would indicate that they would not be converted in the same way as proselytes, who would leave their native land and journey to Judea. That this would not happen in the case of those converted to Christ is shown in Zephaniah: to him they shall bow down, each in his own place (Zeph 2:11). Therefore, to each one living in his own place, where it was said to them in former times, you are not my people, there they shall be called the sons of the living God by divine adoption: to all who believed in his name, he gave them power to become children of God (John 1:12).”