1-3. You shouldn’t have any trouble understanding this, friends, for you know all the ins and outs of the law—how it works and how its power touches only the living. For instance, a wife is legally tied to her husband while he lives, but if he dies, she’s free. If she lives with another man while her husband is living, she’s obviously an adulteress. But if he dies, she is quite free to marry another man in good conscience, with no one’s disapproval.
7. But I can hear you say, “If the law code was as bad as all that, it’s no better than sin itself.” That’s certainly not true. The law code had a perfectly legitimate function. Without its clear guidelines for right and wrong, moral behavior would be mostly guesswork. Apart from the succinct, surgical command, “You shall not covet,” I could have dressed covetousness up to look like a virtue and ruined my life with it.
13. I can already hear your next question: “Does that mean I can’t even trust what is good [that is, the law]? Is good just as dangerous as evil?” No again! Sin simply did what sin is so famous for doing: using the good as a cover to tempt me to do what would finally destroy me. By hiding within God’s good commandment, sin did far more mischief than it could ever have accomplished on its own.