Toward Ecosophy

Here again, demonic possession is something very distinctive and quite rare: the human personality is expelled or overridden and a different being, a malevolent spirit who knows very little about the human world, takes over a human body. I recommend Felicitas Goodman's book How About Demons? for a good survey of how that actually looks in practice. It's much, much more than simple narcissism -- it generally makes a florid psychotic break look relatively calm and rational.