It is said that the Book of Heaven is used to predict the future, but this is not the case. The Book of Heaven is used to record the past. There are thousands of heavenly books in this world, but no one knows where the first heavenly book is. There is a legend that the Heavenly Book is a person's memory. If the Heavenly Book is destroyed, that memory is gone and can never be retrieved. If a person dies, he or she can be resurrected, but if the Book of Heaven is destroyed, there won't be any happy ending.