From the DesringGod blog:
Martyn Lloyd-Jones on what the church is for:
The primary task of the Church is not to educate man, is not to heal him physically or psychologically…. I will go further; it is not even to make him good. These are things that accompany salvation; and when the Church performs her true task she does incidentally educate men and give them knowledge and information…she does make them good and better than they were. But my point is that those are not her primary objectives. Her primary purpose is not any of these; it is rather to put man into the right relationship with God, to reconcile man to God. (Preaching & Preachers, 30)
To read an article on the mission of the church, go here.