The title of the book, The X-Manual, is taken from the word exousia, from the subtitle. It is the Greek word for authority. The word is used throughout the New Testament. For our purposes, it is used to express the divine authority or right to cast out demons--""I have given you authority [exousia] to trample on snakes and scorpions and to overcome all the power of the enemy; nothing will harm you"" (Luke 10:19 NIV). Jesus gives believers authority...