My husband was brought up in a devout Christian home, but somewhere in his teens, he decided to rebel and got heavily into the occult and witchcraft. He got to the point
of status of Warlock in a local coven, casting spells, etc. One night he was sitting in his room alone evoking spirits when he realized that something came in with considerable power. The room turned ice cold, a horrible smell of sulfur filled the room, and he saw a very large manifested being. While this was something that he normally would be accepting of, he felt a great sense of evil that he never had before. He actually got scared, so he turned immediately to his witches bible to see what could be done to get rid of this thing.
(Stay with me now, this is where it gets exciting!!!!)
As he opened the book, it led him to somewhere near the end, and it told him that there were several options he could use, however in this case, the only option that would really work with this sort of thing was to "Quote scripture from the Holy Bible" and it actually gave verses to recite. My husband doesn't remember the verses, he knows that the presence left, and from that moment on, from that encounter, God changed him. My husband, of course, shares this testimony much better than me, but for awhile he sat there and contemplated. If a book which promises so much power and control, has to ultimately use the Bible to thwart off itself, then where does the real power lie, only with God Himself!