So, every man knows that his I, ego, or self has no power, nor any control over any part of his body except his brain and voluntary muscles. For example, no man can determine his complexion; nor the color of his hair; nor of his eyes; nor the length of his nose, nor his feet; nor the size of his head. These facts prove, conclusively, that the Creator generates, guides and controls the forces which build up the embryo body. Sec. 8. Human Body is a Complex Animal Machine The human soul knows, feels and wills. It resides in the brain and governs the body by means of the brain and nerves; the stomach digests the food and makes nutriment for the body; the heart pumps the blood to and from the several parts of it, the arteries and veins carry the blood from the heart and back to it; the blood carries fresh building materials to every part of the body, and gathers up, and carries waste matter back to the heart and lungs; the lungs purify and enliven the blood; the liver secretes bile and cleanses the blood; the muscles and bones move the body and every part of it; the nerves carry messages from the brain to every part of the body and from every other part to the brain; the kidneys and other organs perform their functions; the work of all these organs being necessary to keep the body in good working order. The brain, stomach, heart, arteries, veins, lungs, blood, muscles, bones, kidneys, etc., may each be considered as a complex animal machine, designed and constructed to perform its special functions. The body, as a whole, is an animal machine, which does much work peculiar to itself. The functions of all organs other than those of the brain and voluntary muscles are performed by them, independently of the will. In other words: all the organs of the body except the brain and the voluntary muscles appear to act automatically as an automatic machine does. For example, the stomach, heart, lungs, liver and kidneys appear to do their work as automatic machines, independently of the will; nor has man any direct control, nor power over the work of any of his organs except that of the brain and voluntary muscles. Thus, he cannot directly compel his stomach to digest his food; nor has he any direct control over the action of his heart, nor over that of his lungs; nor can he directly compel his liver to secrete bile. All he can do is to take medicine or some other substance into his stomach, and thence into his blood to stimulate, reduce, or modify the action of his organs; or change his environment. No male has any direct control nor any voluntary agency in the formation of spermatozoä in his genital organs; nor has any female any control over, nor any voluntary part in, the formation of eggs in her ovaries. In fact fully ninety-nine per cent of mankind are wholly ignorant of the existence of spermatozoä and ova (eggs), having no knowledge, whatever, of the mechanism by which their own offspring are brought into being.