They can't stand it.

One night i dreamed about one of them, probably a high rank demon too since he was sitting on a throne, and he kept laughing at me. But as soon as i said the Jesus prayer (Lord Jesus Christ, son of God, have mercy on me a sinner) he got all serious and was evidently annoyed.
Let this be a reminder of the impotence of our enemies: a simple sentence has the power to make them mad.