EXORCIZO, te, immundissime spiritus, omnis incursio adversarii, omne phantasma, omnis legio. (I cast thee out, thou unclean spirit, along with the least encroachment of the wicked enemy, and every phantom and diabolical legion.) — From the Roman Ritual of the Catholic Church, its Rite of Exorcism
Is 'The Exorcist' based on a true story? Yes it is. 
This is Real-life tale of Roland Doe's possession.
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