Mark tells us nothing about the origin of demons; they are simply there. His exorcism accounts only provide the barest minimum of information about them. Demons are disembodied, supernatural beings who can dwell in humans and animals, even though originally they do not belong there. They are unclean and malevolent, and they can cause significant harm. Most importantly for Mark, the demons recognize Jesus immediately and address him with a curious mixture of utmost respect and dread, fearing for their lives. They realize that they are powerless, with no means to defend themselves. But Mark says
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