When I eat food, I do it consciously; when I assimilate it, I do it unconsciously. When the food is manufactured into blood, it is done unconsciously. When out of the blood all the different parts of my body are strengthened, it is done unconsciously. And yet it is I who am doing all this; there cannot be twenty people in this one body. How do I know that I do it, and nobody else? It may be urged that my business is only in eating and assimilating the food, and that strengthening the body by the food is done for me by somebody else. That cannot be, because it can be demonstrated that almost every action of which we are now unconscious can be brought up to the plane of consciousness. The heart is beating apparently without our control. None of us here can control the heart; it goes on its own way. But by practice men can bring even the heart under control, until it will just beat at will, slowly, or quickly, or almost stop. Nearly every part of the body can be brought under control. What does this show? That the functions which are beneath consciousness are also performed by us, only we are doing it unconsciously. We have, then, two planes in which the human mind works. First is the conscious plane, in which all work is always accompanied with the feeling of egoism. Next comes the unconscious plane, where all work is unaccompanied by the feeling of egoism.