Genesis 17:11

We, therefore, instructed by the apostle Paul, say that just as many other things were made in the figure and image of future truth, so also that circumcision of flesh was bearing the form of spiritual circumcision about which it was both worthy and fitting that "the God of majesty" give commands to mortals. Hear, therefore, how Paul, "a teacher of the Gentiles in faith and truth," teaches the church of Christ about the mystery of circumcision. "Behold," he says, "the mutilation"—speaking about the Jews who are mutilated in the flesh—"for we," he says, "are the circumcision, who serve God in spirit and have no confidence in the flesh." This is one opinion of Paul about circumcision. Hear also another: "For he is not a Jew who is so outwardly; nor is that circumcision which is outwardly in the flesh. But he is a Jew who is one inwardly with circumcision of the heart in the spirit, not in the letter." Does it not seem more appropriate to you to speak of such a circumcision among the saints and friends of God than to speak of a pruning of the flesh?But the novelty of the expression may perhaps deter not only the Jews but even some of our brothers. For Paul, who introduces "circumcision of the heart," seems to assume things that are impossible. For how shall it be possible that a member be circumcised that, covered by the internal viscera, lies hidden even from the view of men?

In what sense is the covenant eternal? One interpretation is that it is eternal according to the One promising, for the things of God are not time conditioned. But relative to us eternal things become time conditioned. Another interpretation is that even when the covenant with Israel was abolished, it was maintained for us, and we are God's [people] in place of them. Circumcision took over a second territory after the faith [came]. For just as the birth of the illegitimate child came first, after the promise of the legitimate one, because the birth of the latter was likewise belated, so now circumcision came first because the time for the spiritual [circumcision] was not yet; but when this new one appears, the other circumcision is thrown out. For "in Christ Jesus," we say, "neither circumcision nor uncircumcision is of any avail." That circumcision was a sign of the covenant, which could be present even in transgressors. But the true circumcision is the perfect observance of the law, the cutting away and removing of everything alien to God and the ability to pass beyond worldly things to approach the transcendent realities through understanding. Of this the eighth day of circumcision is the symbol. For the eighth day is supernatural, even as the Savior, by accomplishing the resurrection on the eighth day, showed the mystery. Likewise appropriate is the text's reference to extermination, whether of those uncircumcised in the flesh or those whose heart has not been circumcised, the uncircumcised of heart, as one would say using Old Testament terminology.

Abraham is ordered to circumcise himself when he is about to receive the inheritance of a true progeny. Is it not evident that "circumcision of the flesh" is the precept of chastity, that one should remove the passions of the flesh and curb the desires that unbridled lust renders indomitable? Indeed, the very word circumcision prescribes this, that every stench of impurity be wiped away and that the stimulus of the passions be removed.

God said again to Abraham: And you shall therefore keep my covenant, you and your offspring after you throughout their generations; this is my covenant which you shall keep between me and you and your offspring after you: Every male among you shall be circumcised; …

And ye shall circumcise the flesh of your foreskin,....