When Paul uses the term “instrument of evil,” he uses a word that can refer to a tool or weapon. Our skills, capabilities, and bodies can serve many purposes, good and bad. In sin, every part of our bodies is vulnerable. In Christ, every part can be an instrument for service. It is the one to whom we offer our service that makes the difference. We are like lasers that can burn destructive holes in steel places or do delicate cataract surgery. Will you give yourself completely to God, asking him to put you to good use for his glory?
Do not let any part of your body become an instrument of evil to serve sin. Instead, give yourselves completely to God, for you were dead, but now you have new life. So use your whole body as an instrument to do what is right for the glory of God. (Romans 6:13 NLT)