Professor James has pointed out that there is apparently no limit to the powers of men; and this is simply because man's power comes from the inexhaustible reservoir of the Supreme. The runner who has reached the stage of exhaustion, when his physical power seems entirely gone, by running on in a Certain Way may receive his "second wind"; his strength is renewed in a seemingly miraculous fashion, and he can go on indefinitely. And by continuing in the Certain Way, he may receive a third, fourth, and fifth "wind"; we do not know where the limit is, or how far it may be possible to extend it. The conditions are that the runner must have absolute faith that the strength will come; that he must think steadily of strength, and have perfect confidence that he has it, and that he must continue to run on. If he admits a doubt into his mind, he falls exhausted, and if he stops running to wait for the accession of strength, it will never come. His faith in strength, his faith that he _can_ keep on running, his unwavering purpose _to_ keep on running, and his action _in_ keeping on seem to connect him to the source of energy in such a way as to bring him a new supply. In a very similar manner, the sick person who has unquestioning faith in health, whose purpose brings him into harmony with the source, and who performs the voluntary functions of life in a certain way, will receive vital energy sufficient for all his needs, and for the healing of all his diseases. God, who seeks to live and express himself fully in man, delights to give man all that is needed for the most abundant life. Action and reaction are equal, and when you desire to live more, if you are in mental harmony with the Supreme, the forces which make for life begin to concentrate about you and upon you. The One Life begins to move toward you, and your environment becomes surcharged with it. Then, if you appropriate it by faith, it is yours. "Ye shall ask what ye will, and it shall be done unto you." Your Father giveth not his spirit by measure; he delights to give good gifts to you. CHAPTER VIII. SUMMARY OF THE MENTAL ACTIONS. Let me now summarize the mental actions and attitudes necessary to the practice of the Science of Being Well: first, you believe that there is a Thinking Substance, from which all things are made, and which, in its original state, permeates, penetrates, and fills the interspaces of the universe. This Substance is the Life of All, and is seeking to express more life in all. It is the Principle of Life of the universe, and the Principle of Health in man. Man is a form of this Substance, and draws his vitality from it; he is a mind-body of original substance, permeating a physical body, and the thoughts of his mind-body control the functioning of his physical body. If man thinks no thoughts save those of perfect health, the functions of his physical body will be performed in a manner of perfect health.