God sets before us work, conflict, self-denial, cross-bearing. The central law of Christian life is ministry, serving. You quote, “Man's chief end is to glorify God and to enjoy him for ever.” Yes; but there is no way of glorifying God save by living to bless the world in Christ's name, to bless men by serving them, loving them, helping them, doing them good. We are debtor, therefore, to every man we meet. We owe him love; we owe him service. We are not to set ourselves up on little thrones and demand homage and service from others; rather we are to do the serving. Christ came "not to be ministered unto, but to minister," and we should be as our Lord.