 The line "the devils greatest trick was convincing man that he  didnt exist" is a reference to a similar line in another movie of  the same Genre, _End of Days (1999)_ (qv). In which Father Kovak  (Rod Steiger (qv)) says: "Satans greatest trick was convincing  man that he didnt exist". It is also a reference to  _Usual Suspects, The (1995)_ (qv) where the line is "The greatest  trick the devil ever pulled was convincing man that he didnt exist"  shows up. In fact, that sentence goes back to  Charles Baudelaire (qv) (1821