Charles Spurgeon Commentary Romans 4:13-14

"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. For if they that are of the law are heirs, faith is made void, and the promise is made of none effect:" — Romans 4:13-14 (ASV)

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. For if they which are of the law be heirs, faith is made void, and the promise made of none effect: (Romans 4:13–14)

But that would also make void circumcision and the whole of the ancient covenant, since the blessing was given to a man whom God had chosen before his circumcision, and before the ceremonial law had been instituted.