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.
Don’t you remember how it was? I do, perfectly well. The law code started out as an excellent piece of work. What happened, though, was that sin found a way to pervert the command into a temptation, making a piece of “forbidden fruit” out of it. The law code, instead of being used to guide me, was used to seduce me. Without all the paraphernalia of the law code, sin looked pretty dull and lifeless, and I went along without paying much attention to it. But once sin got its hands on the law code and decked itself out in all that finery, I was fooled, and fell for it. The very command that was supposed to guide me into life was cleverly used to trip me up, throwing me headlong. So sin was plenty alive, and I was stone dead. But the law code itself is God’s good and common sense, each command sane and holy counsel.
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.