A creative idea takes shape in the mind of somebody who thereupon feels himself called upon to transmit this idea to the world. He propounds his faith before others and thereby gradually wins a certain number of followers. This direct and personal way of promulgating one's ideas among one's contemporaries is the most natural and the most ideal. But as the movement develops and secures a large number of followers it gradually becomes impossible for the original founder of the doctrine on which the movement is based to carry on his propaganda personally among his innumerable followers and at the same time guide the course of the movement.