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the wise use of the will, as we have seen, lies the greatest human power, while its misuse is the most potent cause of trouble.
 
Of all known forms of life, then, the energy that is set free by this changed attitude is the most important, the most powerful, and, probably, the least understood. Used ignorantly, it brings all our misery; used wisely, its power of developing health and happiness is limitless. It is essential to a just understanding of it, and to the knowledge of how to help one's self, that the reader bear in mind the central thought of each of the foregoing chapters. For we have learned that all power acts through something; and, in order to understand how the changed attitude may even affect bodily disease, one must remember how disease is built up.
 
To many people it seems impossible that a changed inner attitude can affect the bodily condition. Yet there are abundant illustrations of such change in emotional experiences such as those of religious conversion. As we have already seen, the mind is captivated, the new belief becomes a new rule for action. Moreover, the new attitude is accompanied by various subconscious and organic responses. The change is due to the alteration of the centre of equilibrium.* The

*See the account of religious conversion given by Professor James in "The Varieties of Religious Experience".