The law cannot enable you to do good (vv. 15-21). Three times in this passage Paul stated that sin dwells in us (Rom. 7:17, 18, 20). He was referring, of course, to the old nature. It is also true that the Holy Spirit dwells in us; and in Romans 8, Paul explained how the Spirit of God enables us to live in victory, something the law cannot help us do.

The many pronouns in this section indicate that the writer is having a problem with self. This is not to say that the Christian is a split personality, because he is not. Salvation makes a man whole. But it does indicate that the believer’s mind, will, and body can be controlled either by the old nature or the new nature, either by the flesh or the Spirit. The statements here indicate that the believer has two serious problems: (1) he cannot do the good he wants to do, and (2) he does the evil that he does not want to do.

Does this mean that Paul could not stop himself from breaking God’s law–that he was a liar and thief and murderer? Of course not! Paul was saying that of himself he could not obey God’s law, and that even when he did, evil was still present with him. No matter what he did, his deeds were tainted by sin. Even after he had done his best, he had to admit that he was “an unprofitable servant” (Luke 17:10). “So I find this law at work: when I want to do good, evil is right there with me” (Rom. 7:21 niv). This, of course, is a different problem from that in Romans 6. The problem there was, “How can I stop doing bad things?” while the problem here is, “How can I ever do anything good?”

The legalist says, “Obey the law and you will do good and live a good life.” But the law only reveals and arouses sin, showing how sinful it is! It is impossible for me to obey the law because I have a sinful nature that rebels against the law. Even if I think I have done good, I know that evil is present. The law is good, but by nature, I am bad! So the legalist is wrong: The law cannot enable us to do good.