John Chrysostom
"I find then a law, that when I want to do good, evil is present with me." What is said is unclear. What does it mean?
Paul is saying, "I praise the law according to conscience, and when I want to do good, I find in it a defender for myself, one who strengthens my will. As I delight in the law, so it approves my disposition."
Do you see how the Apostle proves that an understanding of good and evil was implanted in us from the beginning? He also proves that the Law of Moses praises this understanding and is itself praised by it.
Earlier he did not say, "I learn from the law," but, "I praise the law" (Rom 7:16). So now he does not say, "I am educated by the law," but, "I delight in the law."
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What does "I delight in" mean? I agree with it as good, just as it agrees with me when I want to do good.
It was given to man from above to desire good and not to desire evil. When the law appeared, it became an accuser of many things in evil and a praiser of still more in good.
Do you see that the Apostle ascribes to the law nothing more than a certain strengthening and supplement?
Although the law praises the good, and I delight in it and desire the good, nevertheless evil is still present, and its action has not been abolished.
Thus, for one who intends to do some good, the law is only an ally in this respect, and only insofar as he himself desires the same thing.
Because the Apostle expressed this unclearly, he later explains it and brings it into greater clarity. He shows how evil is present and how the law assists the one who desires to do good.
"For I delight in the law of God according to the inward man." "I knew the good even before the law," says the Apostle, "and when I found it depicted in the writings, I praised it."