The members, who experience the address of Christ when they are called together as the Body, give testimony to that Body as they respond to that call in their other activities.
The power of the church’s witness is seen in transformed lives within the community and the mission of the church is to offer to others that contact with the eternal which can cure their souls and result in their transformation as well. Sometimes such transformation does require strong sacrifice and other times it is simply an enhancement of an already good life. It is always the offering of our “bodies as a living sacrifice, holy and acceptable to God, which is your spiritual worship.” (Romans 12:1)