Adam Clarke's Commentary on the Bible - Romans 4:13
For the promise, that he should be the heir of the world - This promise intimated that he should be the medium through whom the mercy of God should be communicated to the world, to both Jews and Gentiles; and the manner in which he was justified, be the rule and manner according to which all men should expect this blessing. Abraham is here represented as having all the world given to him as his inheritance; because in him all nations of the earth are blessed: this must therefore relate to... read more
Adam Clarke's Commentary on the Bible - Romans 4:12
And the father of circumcision - He is also the head and representative of all the circumcision of all the Jews who walk in the steps of that faith; who seek for justification by faith only, and not by the works of the law; for this was the faith that Abraham had before he received circumcision. For, the covenant being made with Abraham while he was a Gentile, he became the representative of the Gentiles, and they primarily were included in that covenant, and the Jews were brought in only... read more