Marlowe was the first to personify the internal struggle of his main character by the use of what are called in The Emperor's New Groove "shoulder angels", good and bad advisors who struggle for control of his mind. The message of the good angel is "Repent!" and that of the bad one is "Despair!". Faustus has an opportunity to repent until quite late in the proceeding, but does not take advantage of it, because he is persuaded that it is too late for him to do so. Consider how this compares to the struggle between Luke Skywalker and the Emperor over the soul of Darth Vader in Return of the Jedi.