I am using a human analogy because of the weakness of your flesh. For just as you offered the parts of yourselves as slaves to moral impurity, and to greater and greater lawlessness, so now offer them as slaves to righteousness, which results in sanctification.
This is why we constantly thank God, because when you received the message about God that you heard from us, you welcomed it not as a human message, but as it truly is, the message of God, which also works effectively in you believers.