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Continue to ChatFAUSTUS. [Stabbing his arm.] Lo, Mephistophilis, for love of thee, I cut mine arm, and with my proper blood Assure my soul to be great Lucifer's, Chief lord and regent of perpetual night! - Christopher Marlowe from https://whatsmyquote.com/quote/faustus-stabbing-his-arm-lo-mephistophilis-for-love-of-thee-i-cut-mine-arm-and-with-my-proper-blood-assure-my