Is Anxiety a demon? It's a question raised, weirdly, by the most popular kids' movie in America right now--and by the entire practice of modern psycotherapy. Typically, when we try to understand mental illness, we refer to natural causes like brain chemistry or personal and family history. But are there some forms of cognitive disorder that don't originate within us--that invade us from the outside? I'm using sources both ancient and modern to tackle that question today after a listener wrote in with some provocative thoughts.

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