In Ephesians we see Paul has a magnificent obsession with the church and seeing churches built to display the glory of God, to display Jesus to the world. The church is made up of each one of us who have been called by Jesus. God changes us in the nitty, gritty, day to day living of our lives. Mark talks about grasping this glorious vision of the church and how, with the power of the Spirit at work in our lives, we can live a life worthy of our call not because we're under compulsion, but because we're passionate about Jesus.
Mark is an elder of Christ Central Church.