Heaven, hell, the mythological age, Olympus, and all the other habitations of the gods are interpreted by psychoanalysis as symbols of the unconscious. The key to the modern systems of psychological interpretation therefore is this: the metaphysical realm = the unconscious. Correspondingly, the key to open the door the other way is the same equation in reverse: the unconscious = the metaphysical realm. ‘For,’ as Jesus states it, ‘behold, the kingdom of God is within you.’ Indeed, the lapse of superconsciousness into the state of unconsciousness is precisely the meaning of the biblical image of the Fall. The constriction of consciousness, to which we owe the fact that we see not the source of the universal power but only the phenomenal forms reflected from that power, turns superconsciousness into unconsciousness and, at the same instant and by the same token, creates the world. Redemption consists in the return to superconsciousness and therewith the dissolution of the world. This is the great theme and formula of the cosmogonic cycle, the mythical image of the world’s coming to manifestation and subsequent return into the nonmanifest condition. Equally, the birth, life, and death of the individual may be regarded as a descent into unconsciousness and return. The hero is the one who, while still alive, knows and represents the claims of the superconsciousness which throughout creation is more or less unconscious. The adventure of the hero represents the moment in his life when he achieved illumination—the nuclear moment when, while still alive, he found and opened the road to the light beyond the dark walls of our living death.
And so it is that the cosmic symbols are presented in a spirit of thought-bewildering sublime paradox. The kingdom of God is within, yet without, also; God, however, is but a convenient means to wake the sleeping princess, the soul. Life is her sleep, death the awakening. The hero, the waker of his own soul, is himself but the convenient means of his own dissolution. God, the waker of the soul, is therewith his own immediate death.
Perhaps the most eloquent symbol of this mystery is that of the god crucified, the god offered, “himself to himself.” Read in one direction, the meaning is the passage of the phenomenal hero into superconsciousness: the body with its five senses…is left hanging to the cross of the knowledge of life and death, pinned in five places (the two hands, the two feet, and the head crowned with thorns). But also, God has descended voluntarily and taken upon himself this phenomenal agony. God assumes the life of man and man releases the God within himself at the mid-point of the cross-arms of the same “coincidence of opposites,” the same sun door through which God descends and Man ascends—each as the other’s food."
— Joseph Campbell, The Hero with a Thousand Faces