As we continue to move through the many images St. Paul uses today we hit one of the most difficult, slave.
But now that you have been freed from sin and have become slaves of God, the benefit that you have leads to sanctification,and its end is eternal life.
While it is hard to imagine, this word referred to two kinds of slavery (voluntary and involuntary). Jesus asks us to freely hand over our imperfect mortal lives, and in return we receive a new sanctified, immortal life.
This is not a one time single action. It requires a daily constant renewal. Each moment of each day we must entrust ourselves totally, allow ourselves to be slaves of God, beloved slaves but slaves nonetheless.