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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Tertullian of Carthage
AD 220
Now it is quite within the purpose of the God of the law that circumcision should be that of the heart, not in the flesh; in the spirit, and not in the letter.