In Scene 14, "'I'll burn my books! Ah, Mephastophilis!", this is an exophoric reference, this is echoed by the magician Prospero at the end of Shakespeare's 'The Tempest' who says he will "drown his books", however, Prospero renounces magic willingly using them to right wrong, so he is portrayed as beneficial whilst Faustus is portrayed as demonic (showing his humiliation)