For the promise that he should be heir of the world did not come to Abraham or to his posterity through law, but through faith-righteousness.

For if those who are righteous through law are heirs, faith is empty and the promise becomes void.

This is why righteousness is of faith, that it may be a free gift; so that the promise stands firm to all Abraham's posterity; not to his children of his faith. For in the sight of the God in whom he believed, who gives life to the dead, and calls into being that which is not, Abraham is the father of us all both Jews and Gentiles,

Nor did he with regard to the promise of God waver in unbelief, but he waxed strong in faith, while he gave God glory,

they are not all children of Abraham because they are Abraham's descendants. The promise was, In Isaac shall thy posterity 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 his posterity.

For thus is the word of promise, According to this season I will come, and Sarah shall bear a son.