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Humans have will. In an exorcism with a human, you are dealing with the human will, and whether that will is sufficiently resolved in terms of what allowed it to be manipulated. The will must have done something to surrender to the presence of the demon. You have to resurrect the moral authority of the person's will.

"EXCLUSIVE: Exorcist Reverend Bob Larson Talks The Devil Inside". Interview with B. Alan Orange, movieweb.com. January 04, 2012.
Humans have will. In an exorcism with a human, you are dealing with the human will, and whether that will is sufficiently resolved in terms of what allowed it to be manipulated. The will must have done something to