"We have made only angels as keepers of the Fire, and We have made their number only as a test for the disbelievers, so that those who have been given the Book may be certain, and that those who believe may increase in belief, and that those who have been given the Book and those who believe may not be in doubt, and that those in whose hearts is a sickness and the disbelievers may say, ‘What did God intend by this as a parable?’ In this way God leads astray whomever He pleases and guides whomever He pleases. No one knows the (angelic) forces of your Lord but Him. It is nothing but a reminder to humankind."