One manifestation of evils spirits may be nightmares; I'm not talking about possession but just their presence. My grandson awakened my daughter nights on end with nightmares. She negated my suggestion to pray audibly in his room against evil spirits at bedtime until I pointed out that she did not have many other options and she had nothing to lose. So she did it and that was the end of the problem. It doesn't prove anything but it works and I don't see anything wrong with it.

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Mary Vanderkooi
Kale Heywott Church (KHC)
Soddo, Ethiopia