What Dreams May Come in the book are derived from my wide range of reading." One of Matheson's influences was Harold W. Percival, an adherent of Theosophy, a belief system with a strong Eastern and Hindu influence. The story also shares the same theme of the ancient Greek myth Orpheus and Eurydice, in which the gifted musician makes a challenging journey to Hell to retrieve his wife. One character quotes from the writings of 18th century Christian mystic Emanuel Swedenborg. Matheson bases his descriptions of the death experience itself on studies by Elisabeth Kübler-Ross and Raymond Moody. When reading these accounts, Matheson found that
Hades to his new realm. Hades obtained his wife and queen, Persephone, through abduction at the behest of Zeus. This myth is the most important one Hades takes part in; it also connected the Eleusinian Mysteries with the Olympian pantheon, particularly as represented in the "Homeric Hymn to Demeter", which is the oldest story of the abduction, most likely dating back to the beginning of the 6th century BC. Helios told the grieving Demeter that Hades was not unworthy as a consort for Persephone: Despite modern connotations of death as evil, Hades was actually more altruistically inclined in mythology. Hades was