John Chrysostom

"For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith."

He had shown that faith is necessary, that it is older than circumcision, that it is more mighty than the Law, that it establisheth the Law. For if all sinned, it was necessary: if one being uncircumcised was justified, it is older: if the knowledge of sin is by the Law and yet it was without the Law made evident, it is more mighty: if it has testimony borne to it by the Law, and establisheth the Law, it is not opposed to it, but friendly and allied to it.