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 the centaurs and to learn how to enter and exit the underworld alive. He found the entrance to the underworld at Taenarum. Athena and Hermes helped him through and back from Hades. Heracles asked Hades for permission to take Cerberus. Hades agreed as long as Heracles didn't harm Cerberus. When Heracles dragged the dog out of Hades, he passed through the cavern Acherusia. The nymph Minthe, associated with the river Cocytus, loved by Hades, was turned into the mint plant, by a jealous Persephone. In older Greek myths, the realm of Hades is the misty and gloomy abode of the