11 And he received the sign of circumcision, a seal of the righteousness of the faith which he had while he was in uncircumcision; that he might be the father of all them that believe, though they be in uncircumcision, that righteousness might be reckoned unto them;
12 And the father of circumcision to them who not only are of the circumcision, but who also walk in the steps of that faith of our father Abraham which he had in uncircumcision.
13 For not through the law was the promise to Abraham or to his seed that he should be heir of the world, but through the righteousness of faith.
14 For if they that are of the law are heirs, faith is made void, and the promise is made of none effect:
15 For the law worketh wrath; but where there is no law, neither is there transgression.
16 For this cause `it is' of faith, that `it may be' according to grace; to the end that the promise may be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham, who is the father of us all
17 (as it is written, A father of many nations have I made thee) before him whom he believed, `even' God, who giveth life to the dead, and calleth the things that are not, as though they were.
18 Who in hope believed against hope, to the end that he might become a father of many nations, according to that which had been spoken, So shall thy seed be.
19 And without being weakened in faith he considered his own body now as good as dead (he being about a hundred years old), and the deadness of Sarah's womb;
20 Yet, looking unto the promise of God, he wavered not through unbelief, but waxed strong through faith, giving glory to God,