The hero’s main feat is to overcome the monster of darkness: it is the long-hoped-for and expected triumph of consciousness over the unconscious. The coming of consciousness was probably the most tremendous experience of primeval times, for with it a world came into being whose existence no one had suspected before. “And God said, ‘Let there be light”‘ is the projection of that immemorial experience of the separation of consciousness from the unconscious.
“The Psychology of the Child Archetype” (1940). In CW 9, Part I: The Archetypes and the Collective Unconscious. P.284