6. But it is not as though the word of God hath come to nought. For they are not all Israel, which are of Israel:
7. neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called.
8. That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.
9. For this is a word of promise, According to this season will I come, and Sarah shall have a son.
10. And not only so; but Rebecca also having conceived by one, even by our father Isaac—