As he says in Hosea: “I will call them ‘my people’ who are not my people; and I will call her ‘my loved one’ who is not my loved one,”
and, “In the very place where it was said to them, ‘You are not my people,’ there they will be called ‘children of the living God.’ ”
Isaiah cries out concerning Israel: “Though the number of the Israelites be like the sand by the sea, only the remnant will be saved.
For the Lord will carry out his sentence on earth with speed and finality.”
It is just as Isaiah said previously: “Unless the Lord Almighty had left us descendants, we would have become like Sodom, we would have been like Gomorrah.”
What then shall we say? That the Gentiles, who did not pursue righteousness, have obtained it, a righteousness that is by faith;
but the people of Israel, who pursued the law as the way of righteousness, have not attained their goal.
Why not? Because they pursued it not by faith but as if it were by works. They stumbled over the stumbling stone.
As it is written: “See, I lay in Zion a stone that causes people to stumble and a rock that makes them fall, and the one who believes in him will never be put to shame.”