Soul fuel
Mere Christianity, Book II, Chapter 3, The Shocking Alternative Christians believe that the devil is real, and that he is a fallen angel. This causes some difficulties. If God is good, why would something He created go so horribly wrong? If He is all-powerful, why allow Satan to do any harm, and if He is all-knowing, why create him in the first place? Lewis proposes that these difficulties are the price to be paid for free will. He responds to the question, "How can anything happen contrary to the will or a being with absolute power?" with this example: "It may be quite sensible for a mother to say to the children, 'I'm not going to go and make you tidy the school-room every night. You've got to learn to keep it tidy on your own.' Then she goes up one night and finds the Teddy bear and the ink and the French Grammar all lying in the grate. That is against her will. She would prefer the children to be tidy. But on the other hand, ...