… The exorcist should not believe too readily that a person is possessed by an evil spirit; but he ought to ascertain the signs by which a person possessed can be distinguished from one who is suffering from some illness, especially one of a psychological nature. Signs of possession may be the following: ability to speak with some facility in a strange language or to understand it when spoken by another; the faculty of divulging future and hidden events; display of powers which are beyond the subject’s age and natural condition; and various other conditions which, when taken together as a
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