But it is not as though the word of God has come to nothing. For they are not all Israel, that are of Israel.
Neither, because they are Abraham's seed, are they all children. But, "In Isaac will your seed be called."
That is, it is not the children of the flesh who are children of God, but the children of the promise are counted as a seed.
For this is a word of promise, "At the appointed time I will come, and Sarah will have a son."
Not only so, but Rebecca also conceived by one, by our father Isaac.
For being not yet born, neither having done anything good or bad, that the purpose of God according to election might stand, not of works, but of him who calls,
it was said to her, "The elder will serve the younger."
Even as it is written, "Jacob I loved, but Esau I hated."
What will we say then? Is there unrighteousness with God? May it never be!
For he said to Moses, "I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion."
So then it is not of him who wills, nor of him who runs, but of God who has mercy.