This, for the most part, is true of all hygiene. There are certain fundamental propositions which we should know; and these will be explained in later chapters, but aside from these propositions, ignore physiology and hygiene. They tend to fill your mind with thoughts of imperfect conditions, and these thoughts will produce the imperfect conditions in your own body. You cannot study any "science" which recognizes disease, if you are to think nothing but health. _Drop all investigation as to your present condition, its causes, or possible results, and set yourself to the work of forming a conception of health._ Think about health and the possibilities of health; of the work that may be done and the pleasures that may be enjoyed in a condition of perfect health. Then make this conception your guide in thinking of yourself; refuse to entertain for an instant any thought of yourself which is not in harmony with it. When any idea of disease or imperfect functioning enters your mind, cast it out instantly by calling up a thought which is in harmony with the Conception of Health. Think of yourself at all times as realizing conception; as being a strong and perfectly healthy personage; and do not harbor a contrary thought. KNOW that as you think of yourself in unity with this conception, the Original Substance which permeates and fills the tissues of your body is taking form according to the thought; and know that this Intelligent Substance or mind stuff will cause function to be performed in such a way that your body will be rebuilt with perfectly healthy cells. 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. Hold with persistence to the thought of perfect health in relation to yourself; do not permit yourself to think in any other way. Hold this thought with perfect faith that it is the fact, the truth. It is the truth so far as your mental body is concerned. You have a mind-body and a physical body; the mind-body takes form just as you think of yourself, and any thought which you hold continuously is made visible by the transformation of the physical body into its image. Implanting the thought of perfect functioning in the mind-body will, in due time, cause perfect functioning in the physical body.