4 They are God's people; he made them his children and revealed his glory to them; he made his covenants with them and gave them the Law; they have the true worship; they have received God's promises;
5 they are descended from the famous Hebrew ancestors; and Christ, as a human being, belongs to their race. May God, who rules over all, be praised for ever! Amen.
6 I am not saying that the promise of God has failed; for not all the people of Israel are the people of God.
7 Nor are all Abraham's descendants the children of God. God said to Abraham, “It is through Isaac that you will have the descendants I promised you.”
8 This means that the children born in the usual way are not the children of God; instead, the children born as a result of God's promise are regarded as the true descendants.
9 For God's promise was made in these words: “At the right time I will come back, and Sarah will have a son.”
10 And this is not all. For Rebecca's two sons had the same father, our ancestor Isaac.