Once Faustus actually gains the practically limitless power that he so desires, however, his horizons seem to narrow. Everything is possible to him, but his ambition is somehow sapped. Instead of the grand designs that he contemplates early on, he contents himself with performing conjuring tricks for kings and noblemen and takes a strange delight in using his magic to play practical jokes on simple folks. It is not that power has corrupted Faustus by making him evil: indeed, Faustus’s behavior after he sells his soul hardly rises to the level of true wickedness. Rather, gaining absolute power corrupts Faustus by making him mediocre and by transforming his boundless ambition into a meaningless delight in petty celebrity.
In the Christian framework of the play, one can argue that true greatness can be achieved only with God’s blessing. By cutting himself off from the creator of the universe, Faustus is condemned to mediocrity. He has gained the whole world, but he does not know what to do with it.
Faustus is constantly undecided about whether he should repent and return to God or continue to follow his pact with Lucifer. His internal struggle goes on throughout the play, as part of him of wants to do good and serve God, but part of him (the dominant part, it seems) lusts after the power that Mephastophilis promises. The good angel and the evil angel, both of whom appear at Faustus’s shoulder in order to urge him in different directions, symbolize this struggle. While these angels may be intended as an actual pair of supernatural beings, they clearly represent Faustus’s divided will, which compels Faustus to commit to Mephastophilis but also to question this commitment continually.