John Chrysostom
It cost Paul great labor to prove that faith received such power as the law could never even imagine.
Since he had already said that God justifies man by faith, he now turns again to the law. He does not say, "Where are the merits of the Jews? Where are the righteous works?" but, "Where is boasting?"
Everywhere he shows that the Jews merely boasted as if they had some advantage over the rest, but they proved nothing in deed.
After asking, "Where then is boasting?" he did not say, "It has disappeared and perished," but, "It has been excluded." This points more to untimeliness, since it was no longer time to boast.
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When judgment has arrived, those who wish to repent no longer have a fitting time. So also then, when the sentence had finally been pronounced and all were ready to perish, He appeared Who destroys every evil by grace.
The Jews no longer had time to defend themselves by justification from the law. If they had needed to establish themselves on this, they should have done so before Christ's coming.
When the One Who saves through faith had come, the time for struggles had already been taken away. Since all the former means had proved ineffective, Christ saves by grace.
Therefore He came now, so that they could not say, if He had appeared at the beginning, that one could also be saved with the help of the law, by one's own labors and merits.
Thus, to remove such shamelessness from them, Christ delayed for a long time. He saved by His grace when it had been clearly proved through everything that human beings lacked sufficient strength of their own.
Therefore, when the Apostle said above, "for a showing of righteousness" (Rom 3:25), he added, "at the present time" (Rom 3:26).
If some were to contradict, they would act like a man who committed grave crimes and could not justify himself in court. He was condemned and had to suffer punishment.
Then, by royal mercy, he was released. After his release, he would have the shamelessness to boast and assert that he had committed no offense.
This should have been proved before the gift appeared. But once it appeared, it was no longer time to boast.
This is exactly what happened with the Jews. They had already been sold from their own homeland. Therefore Christ came, and by His coming deprived them of boasting.
For the one who says of himself that he is a teacher of children, who boasts in the law and calls himself an instructor of the foolish, yet needs a Teacher and Savior like them, has no ground for boasting.
If even before this, circumcision was uncircumcision, then all the more now, since it has been abolished both for the past and for the present.
Having said, "It has been excluded," the Apostle shows how this happened. How, then, was it abolished? the Apostle asks.
"By what law? Of works? No, but by the law of faith."
See how Paul even called faith a law. He gladly uses the former names in order to soften what seemed to be a novelty.
In what, then, does the law of faith consist? In salvation by grace.
Here the Apostle proves the power of God. He not only saved, but justified and brought into boasting, needing none of our works for this, but requiring faith alone.
He says this while training the believing Jew in modesty, and humbling the unbelieving Jew, so as afterward to draw him also.
If the one who received salvation begins to think much of himself, then by looking into the law he will learn that the law itself stopped his mouth.
The law itself accused him, refused him salvation, and deprived him of boasting. The unbeliever, in turn, having been humbled by the same thing, may be brought to faith.
Do you see what the riches of faith are? Do you see how it removed us from all that came before, not even allowing us to boast in it?