Romans 7:7-8

7So someone might say, ‘God's Law must be bad.’ No! Certainly, it is not bad! Without that law, I would not have known what sin really is. One rule says, ‘You must not want to take things for yourself that belong to other people.’ Without that command, I would not have known that it is wrong to want other people's things.

8But the command gave sin a chance to come into my thoughts. As a result, I started to want all kinds of wrong things. If there is no law to tell us what is wrong, then sin has no power to make us guilty.