For that which I do I know not: for what I would, that do I not; but what I hate, that do I.
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Augustine of Hippo
AD 430
This may appear to the less discerning to contradict [verse ]. How can sin be made manifest if it is not understood? But here “I do not understand” means “I do not approve.” For instance, darkness cannot be seen, but it is perceived in contrast to light; in other words, to perceive darkness is not to see it. Likewise sin, because it is not made clear by the light of righteousness, is discerned by not understanding in the way that darkness is perceived by not seeing. “Who understands his own transgressions? on Romans”
It appears that this refers to the ignorant Gentiles, whose thoughts Paul is reproducing. For having consigned their destiny and future to their own lusts even to the point of regarding vain idols as having some power over our lives, they deprive man of his glory, which is the ability to live freely, and to have full and complete control over his own will to do whatever he wishes…. It may be that someone who is forced to act against his will cannot be blamed for it, but at the same time no rational person will praise him for his godliness and righteousness either. For why should somebody be praised for doing things against his own will, even if he is forced to do so by a power over which he has no control? Explanation of the Letter to the Romans.
For that which I work, I understand not. To know, or understand is often, in the style of the Scriptures, the same as to approve or love: so the sense here is: I approve not what I do, that is, what happens to me in my sensitive part, in my imagination, or in the members of my body, which indeed the just man rather suffers than does; and this is the sense, by what immediately follows, the evil which I hate, that I do, i.e. that I suffer, being against my will; and I do that which I would not. (Witham)
I do not that good which I will The apostle here describes the disorderly motions of passion and concupiscence; which oftentimes in us get the start of reason, and by means of which even good men suffer in the inferior appetite what their will abhors: and are much hindered in the accomplishment of the desires of their spirit and mind. But these evil motions, (though they are called the law of sin, because they come from original sin, and violently tempt and incline to sin) as long as the...
And hold out his hand to one who is about to follow? But how can one practise what he teaches, unless he is like him whom he teaches? For if he be subject to no passion, a man may thus answer him who is the teacher: It is my wish not to sin, but I am overpowered; for I am clothed with frail and weak flesh: it is this which covets, which is angry, which fears pain and death. And thus I am led on against my will;
Wherefore even the sainted Paul says "For what I would, that do I not, but what I would not, that I do; ".
Hence evil, as though besieging me, cleaves to me and dwells in me, justice giving me up to be sold to the Evil One, in consequence of having violated the law. Therefore also the expressions: "That which I do, I allow not "and "what I hate, that do I".
Now then it is no more I that do it, but sin that dwelleth in me. For I know that in me-that is, in my flesh-dwelleth no good thing."
