is very clear that Lucifer
will only make a deal with Faustus
if he signs a formal deed of gift signed with his own blood. Faustus' blood thus symbolizes some true essence of himself, which Lucifer desires as a sign of his commitment. When Faustus tries to sign the agreement, the blood congeals, and Faustus interprets this as a sign that his own body is reluctant to make the bargain with Lucifer. As Faustus' death draws near and he considers repenting, he says that a single drop of Christ's blood would save him. Christ's blood also serves as a symbolic guarantee of a bargain, though a holy one in contrast to that between Lucifer and Faustus. Christ's blood is shed through his crucifixion, the sacrifice by which Jesus redeemed mankind's sins. While the imagery of blood is thus an important symbol throughout the play, there is also a tension between blood as a physical part of Faustus' body, of which he is aware (he fears devils tearing his flesh and causing him pain), and blood as a symbol of someone's inner essence or soul, which Faustus entirely neglects.