John Chrysostom
The Apostle proved that faith is necessary, that it is older than circumcision, stronger than the law, and establishes the law. Since all have sinned, faith is necessary. If Abraham was justified while uncircumcised, faith is older than circumcision.
If through the law comes knowledge of sin, and faith appeared apart from the law, then faith is also stronger than the law. Finally, if the law bears witness to faith, and faith establishes the law, then faith is not opposed to it, but friendly to it and allied with it.
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Now the Apostle again proves, but in another way, that it was impossible to receive the inheritance through the law. Having compared faith with circumcision and marked its superiority, he again sets it against the law, saying: “For if those who are of the law are heirs, faith is made void.”
Lest anyone say that it is possible both to have faith and to keep the law, the Apostle proves that this is impossible. Whoever clings to the law in the opinion that it can save dishonors the power of faith.
Therefore he says, “faith is made void,” that is, there is no need for salvation by grace, since faith cannot display its power. And “the promise is made of no effect.” Perhaps a Jew will object: what need have I of faith?
If this is true, then together with faith the promises too are destroyed. Notice that the Apostle contends with the Jews in everything from the very beginning, from the time of the patriarch.
Having shown by Abraham’s example that righteousness is co-heir with faith, he proves the same concerning the promise. So that the Jew should not say, “What is it to me that Abraham was justified through faith?” Paul says that what matters most to the Jew, the promise of inheritance, cannot be fulfilled without faith. This especially alarms the Jews.
Of which promise does he speak? Of the promise that the Jew is heir of the world, and that all are blessed in him. The Apostle next explains how this promise has been made void.