Point out and discuss the many places where Faustus seems to have doubts about his bargain with the Devil, where he seems to want to "do the right thing" but doesn't follow through. Consider, of course, the "Good Angel" and also the Old Man in Scene 12. What do you think Marlowe's message might be in not allowing Faustus to be saved by repenting? Why doesn't Faustus repent?
The first time he goes to seal the deal with his blood gives him a moment where he considers the thought to repent. The Latin words that appear make him wonder if it's not a sign to change his mind. The Good Angel of course always lets him know when he appears that it isn't too late to return to Christ. The old man in Scene 12, who I think is to represent Jesus in disguise, tries to also warn him. At the end when he starts pleading once it's time for him to go to his hell he of course would like to be saved or atleast have his punishment lessened. I think Marlowe's message in not allowing him to be saved was just his way of showing us that not everyone really wants to be saved. Some people just choice hell. Having power over others to them are more appealing then then having eternal life in heaven. Some even think heaven doesn't exists so wither we want to think about it or not, there are those that will spend their eternity in hell.