The sinister, the terrible never deceive: the state in which they leave us is always one of enlightenment. And only this condition of vicious insight allows us a full grasp of the world, all things considered, just as a frigid melancholy grants us full possession of ourselves. We may hide from horror only in the heart of horror. (__he Medusa_)

Potter is mocked by a faculty member for the idea that there is evil in the world from which even children need to learn to defend themselves by the actual practice of doing so rather than familiarity with theory.

You cannot love God and tolerate evil. Psalm 97:10.

All good things come from love; God used the cross a symbol of His love, to paralyze and defeat all forces of evil. God is love. John 3:16

Although terrifying, the evil ghost will probably pose no real danger to you or your family. On the other hand, if you have a demonic infestation, your entire household is in very real danger. A demonic entity will not usually confront you or induce you to flee the home. Because, unlike the evil ghost, the demon does not actually want you to leave. On the contrary, it wants you to stick around so it can destroy your life and sully your soul from the inside.

Heaven is the only place where prayers are not made.