 Both the title of the work and much of its philosophical content relate to the supreme yearning within Satan to achieve salvation.The book's main contribution to Faustian literature is the introduction of the concept that above all other people it is Satan who most truly believes in the Gospel – and yet he is forbidden ever to partake of it.The novel is notable for its attempts to mix Christian thought with popular heterodox themes of the day, such as reincarnation and Theosophy or Blavatskyism.