Music is behind life and rules life; from music springs all life. The whole of creation exists in rhythm. And in a general phrase it may be said that there is one common source of human disease, and that is disorder in rhythm. Rhythm is broken by congestion; and again rhythm is broken when activity goes beyond the boundaries of normality. For it is a phenomenon of activity that it produces energy of itself. In any activity, in walking, in speaking, in thoughts and imaginations, activity increases with its own energy; so that the speed at the end is greater than the speed at the beginning, until the climax when it bums itself out. Also activity gains energy when caught into the speed of a greater activity. Riding quietly along a road one finds that one's horse will break into a canter if other horses go cantering past.