Campbell's ideas regarding myth and its relation to the human psyche are dependent in part on the pioneering work of Sigmund Freud, but in particular on the work of Carl Jung, whose studies of human psychology, as previously mentioned, greatly influenced Campbell. Campbell's conception of myth is closely related to the Jungian method of dream interpretation, which is heavily reliant on symbolic interpretation.
Jung's insights into archetypes were in turn heavily influenced by the Bardo Thodol (also known as the The Tibetan Book of the Dead). In his book The Mythic Image, Campbell quotes Jung's statement about the Bardo Thodol, that it "belongs to that class of writings which not only are of interest to specialists in Mahayana Buddhism, but also, because of their deep humanity and still deeper insight into the secrets of the human psyche, make an especial appeal to the layman seeking to broaden his knowledge of life... For years, ever since it was first published, the Bardo Thodol has been my constant companion, and to it I owe not only many stimulating ideas and discoveries, but also many fundamental insights."
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