Rom 4:13

“Long before Moses ever existed, the Lord appeared to Abraham and said: "Go from your country and your kindred and your father's house to the land that I will show you. And I will make of you a great nation, and I will bless you and make your name great, so that you will be a blessing. I will bless those who bless you, and him who curses you I will curse; and by you all the families of the earth will be blessed."”

“"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.”

“Then when he says, for not through the law, he explains his statement that circumcision or any work of the law did not justify in virtue of a divine promise. In regard to this he does two things: first, he states his proposition; second, he proves it, at for if they who are of the law. First, therefore, the Apostle accepts on the authority of Genesis the promise made to Abraham and his seed that he should be heir of the world, i.e., that all the nations of the world would be blessed in him: by you all the families of the earth shall be blessed (Gen 12:3). He says, and to his seed, because even though this promise was not to be fulfilled in him, it was to be fulfilled in his descendants: by your seed shall all the nations of the earth be blessed (Gen 22:18). But this seed is principally understood as Christ: now the promises were made to Abraham and to his seed. It does not say, 'and to seeds,' referring to many, but referring to one (Gal 3:16), because in the one in whom it is to be fulfilled it is shown that he would be heir of the world: ask of me and I will make the nations your heritage (Ps 2:8). Secondarily, it is fulfilled in those who through Christ's grace are spiritually the seed of Abraham: the children of the promise are accounted for the seed (Rom 9:8). Through Christ they inherit the world, inasmuch as all things are for the glory of the elect: all are yours and you are Christ's (1 Cor 3:22). In regard to this promise he denies one thing and asserts another. He denies that such a promise came through the law. This is not said on account of the promise itself, because at the time of the promise the law had not been given, but in reference to the fulfillment of the promise, so that the sense is that such a promise was not made to Abraham as something to be fulfilled through the law, because, as it is said: the law made nothing perfect (Heb 7:19). What he asserts is that such a promise was to be fulfilled through the justice of faith, because the saints through faith conquered kingdoms (Heb 11:33).”

“It is clear that the law had not yet been given, neither was there as yet circumcision, when the promise was made to Abraham the believer and to his seed, which is Christ, who would cleanse the sins of all. Therefore Abraham was made heir to the world not by the merit earned from keeping the law but by faith. The heir of the world is the heir of the earth, which he obtained in his children. For Christ is the heir of the nations, as David sings: "I will make the nations your heritage and the ends of the earth your possession."”