But it is not that the word of God has taken no effect. For they are not all Israel who are of Israel,
nor are they all children because they are the seed of Abraham; but, "In Isaac your seed shall be called." a8
That is, those who are the children of the flesh, these are not the children of God; but the children of the promise are counted as the seed.
For this is the word of promise: "At this time I will come and Sarah shall have a son." b10
And not only this, but when Rebecca also had conceived by one man, even by our father Isaac
(for the children not yet being born, nor having done any good or evil, that the purpose of God according to election might stand, not of works but of Him who calls),
it was said to her, "The older shall serve the younger." c13
As it is written, "Jacob I have loved, but Esau I have hated." d14
What shall we say then? Is there unrighteousness with God? Certainly not!
For He says to Moses, "I will have mercy on whomever I will have mercy, and I will have compassion on whomever I will have compassion." e16
So then it is not of him who wills, nor of him who runs, but of God who shows mercy.