And yet, were this not so, a man might have rejected it and said, What is circumcision? For is it any good deed on his part that has it? Is it any manifestation of a right choice? For it takes place at an unripe age, and those in the wilderness too remained uncircumcised for a long time. And from many other points of view also, one might look at it as not necessary. And yet it is not on this foot that he rejects it, but upon the most proper ground, from the case of Abraham. For this is the most exceeding victory—to take the very reason for showing it to be of small regard, whence it was held by them in reverence. Now he might have said that even the prophets call the Jews uncircumcised. But this is no disparagement of circumcision, but of those that hold ill to it. For what he aims at is to show that even in the very best life, it has not the least force. This is what he next proves. And here he does not bring forward the Patriarch, but having previously overturned it upon other grounds, he keeps him till afterwards, when he brings in what he has to say of faith, on the words— “How then was it reckoned” to Abraham? “when he was in circumcision, or in uncircumcision?” For so long as it is struggling against the Gentile and the uncircumcised, he is unwilling to say anything of this, lest he should be over irksome to them. But when it comes in opposition to the faith, then he disengages himself more completely for a combat with it. Up to the present point then it is uncircumcision that the contest is against, and this is why he advances in His discourse in a subdued tone, and says,
“For circumcision verily profits if you keep the Law; but if you be a breaker of the Law, your circumcision is made uncircumcision.” For here he speaks of two uncircumcisions, and two circumcisions, as also two laws. For there is a natural law and there is a written law. But there is one also between these, that by works. And see how he points these three out, and brings them before you.
“For when the Gentiles,” he says, “which have not the Law.” What Law, say? The written one. “Do by nature the things of the Law.” Of what Law? Of that by works. “These having not the Law.” What Law? The written one. “Are a law unto themselves.” How so? By using the natural law. “Who show the work of the Law.” Of what law? Of that by actions. For that which is by writing lies outside; but this is within, the natural one, and the other is in actions. And one the writing proclaims; and another, nature; and another, actions. Of this third there is need, for the sake of which also those two exist, both the natural and the written. And if this be not present they are of no good, but even very great harm. And to show this in the case of the natural he said, “For wherein you judge another, you condemn yourself.” But of the written Law, thus— “You who preaches that a man should not steal, do you steal?” Thus also there are two uncircumcisions, one that of nature, and the second from conduct: and one circumcision in the flesh, and the other from the will. I mean for instance, a man has been circumcised upon the eighth day; this is circumcision of the flesh: a man has done all the Law bids him; this is circumcision of the mind which St. Paul requires above all, yea rather the Law also. See now how having granted it in words, he in deed does away with it. For he does not say the circumcision is superfluous, the circumcision is of no profit, of no use. But what says he? “Circumcision verily profits if you keep the Law.” He approves it so far, saying, I confess and deny not that the circumcision is honorable. But when? When it has the Law kept along with it.
“But if you be a breaker of the Law, your circumcision is made uncircumcision.” He does not say, it is no more profitable, lest he should seem to insult it. But having stripped the Jew of it, he goes on to smite him. And this is no longer any insult to circumcision, but to him who through listlessness has lost the good of it. As then in the case of those who are in dignified stations and are after convicted of the greatest misdemeanors, the judges deprive them of the honors of their stations and then punish them; so has Paul also done. For after saying, if you are a breaker of the Law, your “circumcision is made uncircumcision,” and having shown him to be uncircumcised, he condemns him after that without scruple.
Ver. 26. “Therefore if the uncircumcision keep the righteousness of the Law, shall not his uncircumcision be turned into circumcision?”
See how he acts. He does not say that the uncircumcision overcomes circumcision (for this was highly grating to those who then heard him), but that the uncircumcision has become circumcision. And he next enquires what circumcision is, and what uncircumcision and he says that circumcision is well doing and uncircumcision is evil doing. And having first transferred into the circumcision the uncircumcised, who has good deeds, and having thrust out the circumcised man that lived a corrupt life into the uncircumcision, he so gives the preference to the uncircumcised. And he does not say, To the uncircumcised, but goes on to the thing itself, speaking as follows: “Shall not his uncircumcision be turned into circumcision?” And he does not say “reckoned,” but “turned to,” which was more expressive. As also above he does not say your circumcision is reckoned uncircumcision, but has been made so.
Ver. 27. “And shall not the uncircumcision which is by nature judge?”
You see, he recognizes two uncircumcisions, one from nature, and the other from the will. Here, however, he speaks of that from nature, but does not pause here, but goes on, “if it fulfil the Law, judge you, who by the letter and circumcision dost transgress the Law?” See his exquisite judgment. He does not say, that the uncircumcision which is from nature shall judge the circumcision, but while where the victory had been, he brings in the uncircumcision, yet where the defeat is, he does not expose the circumcision as defeated; but the Jew himself who had it, and so by the wording spares offending his hearer. And he does not say, “you that hast the Law and the circumcision,” but yet more mildly, “you who by the letter and circumcision dost transgress the Law.” That is, such uncircumcision even stands up for the circumcision, for it has been wronged and comes to the Law's assistance, for it has been insulted, and obtains a notable triumph. For then is the victory decided, when it is not by Jew that Jew is judged, but by the uncircumcised; as when he says, “The men of Nineveh shall rise in judgment against this generation, and shall condemn it.” It is not then the Law that he dishonors (for he reverences it greatly), but him that does disgrace to the Law. Next, having settled these grounds clearly, he goes on confidently to define what the Jew really is; and he shows that it is not the Jew, nor the circumcision, but he that is no Jew, and uncircumcised, whom he is rejecting. And he seems indeed to stand up in its behalf, but yet does away with the opinion regarding it, securing men's concurrence by the conclusion he comes to. For he shows not only that there is no difference between the Jew and the uncircumcised, but that the uncircumcised has even the advantage, if he take heed to himself, and that it is he that is really the Jew; and so he says:
Ver. 12. “For he is not a Jew which is one outwardly.”
Here he attacks them as doing all things for show.
Ver. 29. “But he is a Jew which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter.”
Source: Homilies on Romans (New Advent)