Clement of Alexandria : Does not the Saviour who heals the soul also heal the body of its passions? But if the flesh were hostile to the soul, he would not have raised an obstacle to the soul by strengthening with good health the hostile flesh. "This I say, brethren, that flesh and blood cannot inherit the kingdom of God nor corruption incorruption." For sin being corruption cannot have fellowship with incorruption which is righteousness. "Are you so foolish?" he says; "having begun in the Spirit are you now to be made perfect by the flesh." — The Stromata Book 3 Jerome : (Verse 3.) So foolish are you, that having begun in the Spirit, you are now being perfected in the flesh? If the Galatians received the Holy Spirit, how were they foolish? But it is immediately resolved, that although they did receive the Spirit, they were deprived of it when they were being perfected in the flesh. Hence they suffered so much in vain. In order to avoid this happening to themselves after sin, David prays, saying: Do not take your Holy Spirit from me (Ps. 50:13). Pay careful attention to the fact that those who follow the Scriptures literally are said to be perfected in the flesh. Therefore, what is written to the Corinthians, 'Living in the flesh, we do not wage war according to the flesh' (2 Cor. X, 3), can be better understood as meaning that those who humbly adhere to the Old Testament are said to wage war in the flesh. However, those who follow the spiritual understanding, though they are in the flesh because they have the same letter as the Jews, do not wage war according to the flesh but transcend from the flesh to the spirit. When you see someone who was the first to believe among the Gentiles, and extends his hand to the plow of Christ, having been preceded by a wise teacher, in such a way as to proceed from the path of the Law to the Gospel, so that he may understand all those things that are written there, about the Sabbath, about unleavened bread, about circumcision, about sacrifices, in a worthy manner for God, and afterwards, after the reading of the Gospel, be persuaded by a Jewish person or a fellow Jew, so that he may abandon the shadows and cloudy allegories and interpret the Scriptures as they are written: can you say of this person: 'Are you so foolish, that after beginning with the Spirit, you are now being perfected by the flesh?' — Commentary on Galatians John Chrysostom : Here again he seasonably interposes a rebuke; time, he says, should have brought improvement; but, so far from advancing, ye have even retrograded. Those who start from small beginnings make progress to higher things; ye, who began with the high, have relapsed to the low. Even had your outset been carnal, your advance should have been spiritual, but now, after starting from things spiritual, ye have ended your journey in that which is carnal; for to work miracles is spiritual, but to be circumcised is carnal. And after miracles ye have passed to circumcision, after having apprehended the truth ye have fallen back to types, after gazing on the sun ye seek a candle, after having strong meat ye run for milk. He says, "made perfect," which means not "initiated" merely, but "sacrificed," signifying that their teachers took and slew them like animals, while they resigned themselves to suffer what those teachers pleased. As if some captain, or distinguished man, after a thousand victories and trophies, were to subject himself to infamy as a deserter, and offer his body to be branded at the will of others. — Homily on Galatians 3 Oecumenius : He says, "Are you so foolish," because, as time has passed, you are running backward. For having begun to be perfected in the Spirit (for this is in general), now you are being perfected in the flesh. For they were being perfected in the Spirit, performing signs, but were being circumcised in the flesh. See, he did not say, "Be perfected," but, "you are being perfected," indicating that, like sheep, they were receiving circumcision, neither knowing nor suffering. "now you are being perfected in the flesh." He indeed spoke of the Spirit as grace, but of the flesh as conduct according to the law. — Commentary on Galatians