"Christ is building His people. He is gathering His flock. He is fulfilling His promise to be with the Christians to the end of the age. He is teaching by the Spirit and through His world. He is marking the Church off from the world through the sign of baptism and by making himself remembered and known and enjoyed in the Lord's Supper. 'Do this' is a demand of the Lord that calls us today to be not just individual followers but a flock, a gathered, a community and a church."
Source: John Piper, What Jesus Demands from the World. Crossway Books. 2006. p.349.