The Ancient Greeks defined mental disorders as “being possessed and punished by the Gods for wrongdoing and can only be cured by prayer”. Greek physicians and philosophers wrote their theories about the treatment of some mental disorders without practicing. In Judeo-Christian societies, mental illness was often seen as “a divine punishment” and “a divine gift”. Some mental disorders were well known in Ancient Mesopotamia, Ancient Egypt, Persia, India and China. With the advent of Islam, a revolution emerged in all scientific fields, including psychology, which will later strongly influence the Western modern psychology.