The hero adventures out of the land we know into darkness; there accomplishes his adventure or again is simply lost to us, imprisoned, or in danger; and his return is described as a coming back out of that yonder. Nevertheless—and here is a great key to the understanding of myth and symbol—the two kingdoms are actually one. The realm of the gods is a forgotten dimension of the world we know. And the exploration of that dimension, either willingly or unwillingly, is the whole sense of the deed of the hero.

Joseph Campbell, The Hero with a Thousand Faces, (3rd. edition), p. 188 http://ift.tt/1ko7PIw

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