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
Magic in the Graeco-Roman world (Circe is called a witch by a companion of Odysseus). In this mode it is worth noting that Circe is representative of a power (the Titans) that had been conquered by the younger Olympian gods such as Zeus, Poseidon and Hades. The 6th century BCE gives rise to scattered references of magoi at work in Greece. Many of these references representing a more positive conceptualisation of magic. Among the most famous of these Greek magoi, between Homer and the Hellenistic period, are the figures of Orpheus, Pythagoras, and Empedocles. Orpheus is a mythical figure, said to have lived in Thrace