For the promise to Abraham or to his descendants, [that] he would be heir of the world, [was] not through the law, but through the righteousness by faith.

For if those of the law [are] heirs, faith is rendered void and the promise is nullified.

Because of this, [it is] by faith, in order that [it may be] according to grace, so that the promise may be secure to all the descendants, not only to those of the law, but also to those of the faith of Abraham, who is the father of us all

And he did not waver in unbelief at the promise of God, but was strengthened in faith, giving glory to God

That is, [it is] not the children {by human descent} [who are] children of God, but the children of the promise are counted as descendants.

For the statement of the promise [is] this: "At this time I will return and {Sarah will have} a son."