Our generation has been intent on the development of the intellect. We have been neglecting the will. "Shell shock" experiences have shown us that the intellect is largely the source of unfavorable suggestion. The will is the controlling factor in the disease. Many another demonstration of the power of will has been furnished by the War. This volume is meant to help in the restoration of the will to its place as the supreme faculty in life, above all the one on whose exercise, more than any other single factor, depends health and recovery from disease. The time seems opportune for its appearance and it is commended to the attention of those who have recognized how much the modern cult of intellect left man unprepared for the ruder trails of life yet could not see clearly what the remedy might be.