Moral. Think then, how vast an evil is it, when God has employed so many methods to reconcile us, and has effected it, that we should again fall back into enmity! This enmity no fresh Baptism, but hell itself awaits; no fresh remission, but searching trial. The mind of the flesh is luxury and indolence, the “mind of the flesh” is covetousness and all kinds of sin. Why is it said the mind of the flesh? While yet the flesh could do nothing without the soul. He does not say this to the disparagement of the flesh, any more than when he says the “natural man,” he uses that expression to the disparagement of the soul, for neither body nor soul in itself, if it receive not the impulse which is far above, is able to achieve any thing great or noble. Hence he calls those acts which the soul performs of herself, “natural; ψυχικά” and those which the body performs of itself “carnal.” Not because these are natural, but because, inasmuch as they receive not that direction from heaven, they perish. So the eyes are good, but without light, will commit innumerable errors; this, however, is the fault of their weakness, not of nature. Were the errors natural, then should we never be able to use them aright at all. For nothing that is natural is evil. Why then does he call carnal affections sins? Because whenever the flesh exalts herself, and gets the mastery over her charioteer, she produces ten thousand mischiefs. The virtue of the flesh is, her subjection to the soul. It is her vice to govern the soul. As the horse then may be good and nimble, and yet this is not shown without a rider; so also the flesh will then show her goodness, when we cut off her prancings. But neither again is the rider shown, if he have not skill. Nay he himself will do mischief yet more fearful than that before named. So that on all hands we must have the Spirit at hand. This being at hand will impart new strength to the rider; this will give beauty both to body and soul. For just as the soul, while dwelling in the body, makes it beautiful, but when she leaves it destitute of her own native energy and departs, like a painter confounding his colors together, the greatest loathsomeness ensues, every one of the several parts hastening to corruption, and dissolution:— so is it also when the Spirit forsakes the body and the soul, the loathsomeness which ensues is worse and greater. Do not then, because the body is inferior to the soul, revile it, for neither do I endure to revile the soul because it has no strength without the Spirit. If one need say anything at all, the soul is deserving of the greater censure than the body; for the body indeed can do no grevious harm without the soul, whereas the soul can do much without the body. Because, we know, when the one is even wasting away, and has no wantonness, the soul is busily employed. Even as those sorcerers, magicians, envious persons, enchanters, especially cause the body to waste away. But besides this, not even luxury is the effect of the necessity of the body, but rather of the inattentiveness of the soul; for food, not feasting, is the object of the necessity of the body. For if I have a mind to put on a strong curb, I stop the horse; but the body is unable to check the soul in her evil courses. Wherefore then does he call it the carnal mind? Because it comes to be wholly of the flesh, for when she has the mastery, then she goes wrong, as soon as ever she has deprived herself of reason, and of the supremacy of the soul. The virtue therefore of the body consists in this, in its submission to the soul, since of itself the flesh is neither good nor evil. For what could the body ever do of itself? It is then by its connection that the body is good, good because of its subjection, but of itself neither good nor evil, with capacity, however, both for one and for the other, and having an equal tendency either way. The body has a natural desire, not however of fornication, nor of adultery, but of pleasure; the body has a desire not of feasting, but of food; not of drunkenness, but of drink. For in proof that it is not drunkenness that is the natural desire of the body, mark how, whenever you exceed the measure, when you go beyond the boundary-lines, it cannot hold out a moment longer. Up to this point it is of the body, but all the rest of the excesses, as e.g., when she is hurried away into sensualities, when she becomes stupefied, these are of the soul. For though the body be good, still it is vastly inferior to the soul, as lead is less of value than gold, and yet gold needs lead to solder it, and just so has the soul need also of the body. Or in the same way as a noble child requires a conductor, so again does the soul stand in need of the body. For, as we speak of childish things, not to the disparagement of childhood, but only of those acts which are done during childhood; so also are we now speaking of the body.
Yet it is in our power, if we will, no longer to be in the flesh, no, nor upon the earth, but in heaven, and in the Spirit. For our being here or there, is not determined so much by our position, as by our disposition. Of many people, at least, who are in some place, we say they are not there, when we say, “You were not here. And again You are not here.” And why do I say this? We often say, “You are not at (ἐ ν) yourself, I am not at (ἐ ν) myself,” and yet what can be more material (a stronger instance of corporeal locality) than this, that a man is near to himself? And yet, notwithstanding, we say that he is not at himself. Let us then be in ourselves, in heaven, in the Spirit. Let us abide in the peace and in the grace of God, that we may be set at liberty from all the things of the flesh, and may be able to attain to those good things which are promised in Jesus Christ our Lord, with whom to the Father, together with the Holy Spirit, be glory, and might, and honor, now and henceforth, and for ever and ever. Amen.
Source: Homilies on Ephesians (New Advent)