Our hands, with all their perfect mechanism, cannot hold a glass of water if there is no will-power to support them. If will-power fails him, a person seemingly healthy will not be able to stand. It is not the body which makes us stand upright, it is our will-power. It is not the strength of body that makes us move about, it is will-power which is holding the body, which is making it go. Therefore, in reality, birds do not fly with their wings, they fly with will-power. Fishes do not swim with their body, they swim with their will-power. And when man has the will to swim he swims like a fish.