John Chrysostom
Not of those who are of circumcision only. If Abraham is father of the uncircumcised not because he himself was uncircumcised, though he was justified in uncircumcision, but because the uncircumcised imitated him in faith, then all the more he will not be forefather of the circumcised by circumcision alone, unless faith is also added.
The Apostle says that he received circumcision so that both we and they might have him as forefather, and so that the uncircumcised would not drive out the circumcised. Do you notice how the uncircumcised were the first to have Abraham as their forefather? If circumcision is honorable because it proclaims righteousness, then uncircumcision also has no small advantage, since it attained righteousness before circumcision.
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Therefore you will be able to have Abraham as forefather when you walk in the steps of faith, and when you do not persist and argue in defense of the law. What faith, tell me? The faith which he had in uncircumcision. Again the Apostle lowers Jewish pride by recalling the time of righteousness. He rightly said “in the steps,” so that you, like Abraham, may believe in the resurrection of dead bodies, since in this also he revealed his faith.
Thus, if you reject uncircumcision, know clearly that circumcision will be of no benefit to you either. If you do not follow in the steps of faith, then even if you were circumcised a thousand times, you would not become a child of Abraham. He received circumcision precisely so as not to reject you, who remain in uncircumcision.
Do not demand this of him. This matter served as an aid to you, not to him. But you will say that circumcision serves as a sign of righteousness. This too was for your sake, though now it is no longer so, since then you needed bodily signs, while now there is no longer need of them.
You will ask again: could the excellence of his soul not have been known by Abraham’s faith? Of course it could. Yet you needed this addition as well. Since you did not emulate spiritual virtue and could not see it, sensible circumcision was given to you. Thus, by exercising yourself in this bodily sign, you might little by little be guided toward spiritual philosophy. Having received circumcision with all zeal, as the sign of the highest dignity, you would learn to imitate and honor the forefather.
God established this not only in circumcision, but also in all the rest, for example, in sacrifices, sabbaths, and feasts. Learn from the Apostle’s next words that Abraham received circumcision for your sake. Having said that Abraham received a sign and a seal, he also indicates the reason, saying: “that he might be the father of circumcision” (Rom 4:11). This is for those who also receive inward circumcision, because if you have only outward circumcision, you will receive no benefit from it.
Circumcision is a sign when the thing of which it is a sign is visible in you, that is, faith. Likewise, if you do not have faith, then the sign can no longer be a sign. Of what, indeed, will it be a sign, and of what a seal, when there is nothing sealed? It would be like showing us a money bag with a seal, when nothing has been placed inside. Circumcision is just as ridiculous when faith is not within.
If circumcision is a sign of righteousness, and you do not have righteousness, then you do not have the sign either. You received the sign so that you might seek the thing whose sign you possess. If you could find it without the sign, then you would have no need of the sign. Circumcision proclaims not righteousness alone, but specifically righteousness in uncircumcision. Therefore circumcision proclaims nothing other than this: there is no need of circumcision.