According to traditional beliefs, obsession is a form of insanity caused by the attack of an evil spirit without. Possession is when an evil spirit takes control from within, although both terms refer to the control of a body by a discarObsession and Possessione force. This belief can be traced back to the earliest records of human history and in the magical rituals of ancient religions. There are examples found in Roman, Greeks and Indian texts, and even in the Bible.
Developments in contemporary science have shed new light on the mysteries of obsession and possession, as the human mind is now understood to be a very delicate instrument, and easily manipulated.