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For the troublesome spirit, if it is possible and not against his beliefs, he should try to find a good priest and ask to have the rite of exorcism performed. Since the spirit comes at night he should sleep with a small light burning. Also, when the annoyance begins he may make the sign of the cross over himself, take a deep breath at the same time, and with great conviction pronounce these words: "In the name, presence, and power of Jesus Christ, I drive you out of this body."
-- Notebooks Category 16: The Sensitives > Chapter 14 : The Sensitive Mind > # 19