The text surveys historical and contemporary uses of mental influence in healing, from ancient talismans and faith cures to formalized suggestion and hypnotism, and it examines how belief, personality, and physician-patient interaction affect symptoms and recovery. It outlines physiological and psychological mechanisms proposed to link mind and body, discusses unconscious mental operations and distant influence, and provides practical guidance on applying psychotherapeutic principles in daily clinical care, including organizing routines and using adjuvants such as suggestion, exercise, posture, and anesthesia while warning against quackery and exaggerated claims.