After accepting Christ as Lord and Saviour, a Christian needs to be transformed in body and mind and present themselves as living sacrifices to God's purposes. While living in the Kingdom of God, the Holy Spirit who dwells and then fills a Christian's body and mind will transform him or her to become more Christ-like.
Transformation of the mind includes spiritual maturity, ability to discern what's good or bad and obedience to God. The subsequent change in a person's attitude and character, made possible from transformation of the mind, will allow for behaviour modification resulting in Christ-like behaviour and actions.