And it shall come to pass, that in the place where it was said unto them,
You are not my people; there shall they be called the children of the living God.
Read Chapter 9
Even if this was said about those Jews who believed and not about the Gentiles, the argument still stands. For if those who had received so many benefits and then had become hardhearted and estranged and had lost their identity as a people were turned around, … what is there to prevent those who were originally aliens from being called and counted worthy of the same blessings if only they obey? Homilies on Romans