This passage in Matt 20:28, is the elevation of the duty of Christian service. Of course Christ did come to earth to win all men to his service, but it was for their sakes rather than his own. To serve him meant salvation; it was sin that kept them from their allegiance to him. And he came to save them from their sins. All the time he was in the flesh he gave rather than accepted service. He was moved by love. Even when the people would have taken him by force to make him king he would not accept it. That was not the kind of service he wanted. He wanted men to serve him in holiness and spiritual power. He gave his body in humiliation and sacrifice in order that they might be lifted up to this higher plane of service. The whole message of the New Testament is that Christ came to earth for the sake of mankind, not for his own sake. And he taught by example the life of humility, self-sacrifice and service which he wishes all men to lead.