<p>Chapter 1<br /><br /><strong>The Principle of Health</strong></p> <p>In the personal application of the Science of Being Well, as in that of the Science of Getting Rich, certain fundamental truths must be known in the beginning, and accepted without question. Some of these truths we state here: The perfectly natural performance of function constitutes health, and the perfectly natural performance of function results from the natural action of the Principle of Life.<br />There is a Principle of Life in the universe, and it is the One Living Substance from which all things are made. This Living Substance permeates, penetrates, and fills the interspaces of the universe. It is in and through all things, like a very refined and diffusible ether. All life comes from its life is all the life there is.<br />A human being is a form of this Living Substance, and has within him a Principle of Health. (The word Principle is used as meaning source.) The Principle of Health in a person, when in full constructive activity, causes all the voluntary functions of his life to be perfectly performed. It is the Principle of Health in a person which really works all healing, no matter what system. or<br />.remedy. is employed, and this Principle of Health is brought into Constructive Activity by thinking in a Certain Way.<br />I proceed now to prove this last statement. We all know that cures are wrought by all the different, and often opposite, methods employed in the various branches of the