what the percipient on the Bardo plane sees is due entirely to his own mental-content; that there are no visions of gods or of demons, of heavens or of hells, other than those born of the hallucinatory karmic thought-forms constituting his personality
The Evans-Wentz edition articulates the text's central psychological claim: Bardo visions are projections of the dying person's own karmic mental content, a reading that directly enabled Jung's psychologizing of the text.
, The Tibetan Book of the Dead (Evans-Wentz Edition), 1927thesis