Ahead of the times Rambam, 1133-1204 AD (probably due to Plato's and Aristotle’s engagement with Ethics), determined that a person has to take care of his soul as well as his body, and just as a person who is sick in his body turns to the doctor, a person who has mental illness needs to go to the doctor of the soul, which is, according to him, the philosopher or the sage. Rambam opposed the deterministic approach, arguing that a person has free will and the ability to change its properties.