But he is a Jew, who is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
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Ambrosiaster
AD 400
It is clear why Paul denies that the circumcision of the flesh has any merit with God. For Abraham was not justified because he was circumcised; rather, he was justified because he believed, and afterward he was circumcised. It is the circumcision of the heart which is praiseworthy before God. To circumcise the heart means to cut out error and recognize the Creator. And because the circumcision of the heart was to come in the future, first Moses said: “Circumcise the hardness of your heart,” and Jeremiah also: “Circumcise the foreskin of your heart.” He said this to Jews who were following idols. For there is a veil over the heart which the one who is converted to God circumcises, because faith removes the cloud of error and grants those who are perfect knowledge of God in the mystery of the Trinity, which was unknown in earlier times. The praise of this circumcision is from God but is hidden to men, for it is the merit of the heart which God looks for, not that of the flesh. But the praise of the Jews is from men, for they glory in the circumcision of the flesh, which comes from their ancestors. Commentary on Paul’s Epistles.