John Chrysostom
Those who rise up against the flesh and exclude it from the number of God's creations base themselves on these words. What can we say to this? The same as we said recently when discussing the law. Just as there he attributes everything to sin, so also here. He did not say that the flesh does this. Quite the contrary: "It is no longer I who do it, but sin that dwells in me." If he says that no good thing dwells in him, this is still not an accusation against the flesh. The fact that no good thing dwells in the flesh does not prove that it is evil in itself. We agree that the flesh is lower and more deficient than the soul. But it is not opposed to it, nor hostile, nor evil. As a lyre is subject to the musician and a ship to the helmsman, so the flesh is subject to the soul.
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The lyre and the ship are not opposed to those who govern and use them. Rather, they are wholly in harmony, though not equal in dignity to the craftsman. Likewise, when someone says that the art is not in the lyre or the ship, but in the helmsman and the lyre-player, he does not dishonor those objects. He shows the difference between the craftsman and the art. So also Paul, when he said, "In my flesh no good thing dwells," did not dishonor the body, but showed the soul's superiority. For it is the soul that directs everything, including the art of steering a ship or playing a lyre. Paul shows the same here, assigning the ruling role to the soul. Having divided man into these two halves, soul and body, he affirms that the flesh is more irrational, lacking understanding, and is something governed, not governing. The soul, however, is wise and able to know what should and should not be done. Yet it does not have enough strength to govern the horse as it wishes. In this, the blame may belong not to the flesh alone, but also to the soul. The soul knows what should be done, but does not put into action what it recognizes. "For to will," says the Apostle, "is present with me, but how to perform what is good I do not find." Here again, by saying "I do not find," he means not ignorance or doubt, but the assault and snares of sin. Expressing this more clearly, he added: "For the good that I will to do, I do not do; but the evil I will not to do, that I do. But if I do what I will not to do, it is no longer I who do it, but sin that dwells in me" (Rom 7:19-20).