What is the source of this consciousness and activity? The circulation of the blood, the energy of the movements of the body, the activity of the nerves and muscles, if we could only know what it is that keeps them in action! A person may say that it all goes on mechanically like a clock, but the clock is not the source of the movement. The mind is the source of the clock; the mind has made the clock, has thought about it, has wound it; it continues to depend upon man to keep it going. Therefore behind "clock" is "man." Even if it only wants winding once a year, still there is man behind it, whom we do not see.