what is the significance of last speech in dr.Faustus?

Faustus' beautiful lines about Christ's blood streaming in the firmament show how well Marlowe can use, and transform, Christian imagery. The whole final monologue is quite rich, and would make an excellent choice for a close reading paper. Faustus is doing more than making a powerful last lament before his death and damnation. Within 57 lines, the speech leaps from concept to concept, spanning vast centuries and idea systems that are worlds apart. Though a close reading seems beyond the scope of this study guide, attention should be paid to the different sections of the monologue. Faustus makes an odd and distinctive appeal to the forces of nature (5.2.163-174); he alludes to various theories and conceptions of the soul (5.2.177-189); even when despairing, toward the monologue's end, he uses striking imagery.