If anyone had personalities inside him other than his own, those entities would surely be demons. But Dissociative Identity Disorder (previously known as Multiple Personality Disorder) has nothing to do with foreign entities. What have been called “personalities” are simply different manifestations of the same person with a different degree of awareness, rather like a sleeping person having a different degree of awareness to when he is awake, or a person “lost” in an absorbing movie is in a different mental state to when he is highly conscious of his immediate surroundings. Looked at from another angle, people manifest a distinctly different “personality” when communicating with a baby than when talking with their boss, and different again when relaxing with a buddy. Different circumstances cause us to switch into a different way of speaking and behaving. These differences, of course, have nothing to do with the demonic. So it is with the commonly misunderstood condition previously known as Multiple Personality Disorder.

Taken from Multiple Personalities & Demons

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