John Chrysostom
"And the uncircumcision by nature will condemn." Do you see that the Apostle had two uncircumcisions in mind, one natural and the other voluntary?
Here, of course, he speaks of the natural one, but he does not stop there. He continues: "if it fulfills the law, you who through Scripture and circumcision are a breaker of the law."
Observe the Apostle's very subtle understanding. He did not say that circumcision is condemned by natural uncircumcision.
Where the advantage of circumcision lay, he also speaks of uncircumcision. Where its deficiency lay, he shows that it is not circumcision itself that is overcome, but the Jew who has circumcision.
In this way he avoids offending the hearer by his words.
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Nor did he say, "it will condemn you who have the law and circumcision." He speaks still more gently: "you who through Scripture and circumcision are a breaker of the law."
That is, natural uncircumcision defends circumcision, because circumcision has been mocked. It helps the law, because the law has been violated.
Behold what a remarkable trophy he sets up. The victory is more brilliant when the Jew is condemned not by a Jew, but by an uncircumcised man.
Christ once said the same: "The men of Nineveh will rise up and condemn this generation" (Matt 12:41).
Therefore the Apostle does not abase the law. On the contrary, he greatly honors it. He abases the transgressor of the law.