John Chrysostom
"But I see another law in my members, warring against the law of my mind." Here again the Apostle called sin a law that wars against us, not according to its dignity, but because of the excessive obedience of those subject to it.
He calls mammon a master and the belly a god, not according to their own dignity, but because of the great slavery of those subjected to them.
So here also he called sin a law because people serve it and fear to abandon it, just as those who have received a law fear not to fulfill it.
Sin, says the Apostle, resists the natural law. This is what he means by "the law of my mind." Thus the Apostle depicts the contest and battle, and lays the whole struggle upon the natural law.
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The Law of Moses was given later, as a kind of addition. Yet neither law accomplished anything great in this struggle, neither the one that taught the good nor the one that praised it. Such is the conquering and surpassing power of sin.
Depicting this, and speaking of defeat in relation to its force, Paul said, "I see another law warring against the law of my mind and bringing me into captivity."
He did not simply say, "overcoming," but "bringing me into captivity by the law of sin." Nor did he say, "by the attraction of the flesh" or "by the nature of the flesh," but "by the law of sin," that is, by authority and force.
How does he say, "which is in my members"? What does this mean? He does not call the members sin, but completely separates them from sin. For that which dwells in something is one thing, and that in which it dwells is another.
Just as the commandment is not evil, although sin took occasion through it, so the nature of the flesh is not evil, although sin wars against us through it.
Otherwise the soul also would be evil, and even more so, insofar as it has authority over what must be done. But this is not so, not at all.
If a tyrant or robber seizes some splendid building or royal palace, what has happened cannot be a condemnation of the house. All the blame falls on those who carried out the plot.
The enemies of the truth do not understand this. Along with impiety, they fall into complete madness. They not only accuse the flesh, but also slander the law.
Yet if the flesh is evil, the law is good, because it wars against it and resists it. But if the law is not good, then the flesh is good, since, according to them, it fights against the law and is hostile to it.
How then do they say that both the flesh and the law are from the devil, while introducing things opposed to each other?
Do you see what irrationality accompanies impiety? The teaching of the Church is not such. It condemns sin alone.
It affirms that both laws given by God, the natural and the Mosaic, are at enmity with sin, not with the flesh.
The flesh is not sin, but God's creation. It is very useful for us even in the struggles of virtue, if we keep watch.