I am not saying this on my own authority. The Law of Moses tells us not to muzzle an ox when it is grinding grain. But was God concerned only about an ox?
I am using these everyday examples, because in some ways you are still weak. You used to let the different parts of your body be slaves of your evil thoughts. But now you must make every part of your body serve God, so that you will belong completely to him.
We always thank God that you believed the message we preached. It came from him, and it isn't something made up by humans. You accepted it as God's message, and now he is working in you.