The Intelligent Substance, from which all things are made, permeates and penetrates all things; and so it is in and through your body. It moves according to its thoughts; and so if you hold only the thoughts of perfectly healthy function, it will cause the movements of perfectly healthy function within you.
The best way to do this is to form a mental image or picture of yourself as being well, imagining a perfectly strong and healthy body; and to spend sufficient time in contemplating this image to make it your habitual thought of yourself.
But the external functioning must conform to the thought; man cannot hope to be well by thinking health, if he eats, drinks, breathes, and sleeps like a sick man.
The universal Life Principle, then, is the Principle of Health in man. It is one with original substance. There is one Original Substance from which all things are made; this substance is alive, and its life is the Principle of Life of the universe. This Substance has created from itself all the forms of organic life by thinking them, or by thinking the motions and functions which produce them.
Man's first step must be to learn how to think perfect health; and his second step to learn how to eat, drink, breathe, and sleep in a perfectly healthy way.