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.
All Commentaries on Romans 2:29 Go To Romans 2
Augustine of Hippo
AD 430
This means that the law should be understood according to the Spirit, and not according to what the letter says. This pertains especially to those who have interpreted circumcision more according to the flesh than according to the Spirit.