25 For I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not be conceited: A partial hardening has happened to Israel until the full number of the Gentiles has come in. 26 And so all Israel will be saved, as it is written:“The Deliverer will come out of Zion; he will remove ungodliness from Jacob. 27 And this is my covenant with them, when I take away their sins.” 28 In regard to the gospel they are enemies for your sake, but in regard to election they are dearly loved for the sake of the fathers. 29 For the gifts and the call of God are irrevocable.

And Rabbi Meir says: Either way you are still called sons, as it is stated: “They are foolish sons” (Jeremiah 4:22). And it also states: “Sons in whom there is no faithfulness” (Deuteronomy 32:20). And it states: “A seed of evildoers, sons who deal corruptly” (Isaiah 1:4). And it states: “And it shall come to pass that, instead of what was said to them: You are not My people, it shall be said to them: Sons of the living God” (Hosea 2:1). The Gemara asks: Why is it necessary to cite these additional proofs introduced by the phrase: And it states? All these verses apparently make the same point. The Gemara explains why all the quotes are necessary. And if you would say: Granted, when they are foolish they are still called sons, as the verse states: “Foolish sons,” but when they do not have faithfulness they are not called sons; therefore, come and hear another verse. And that verse states: “Sons in whom there is no faithfulness.”