One is forced to speak not of what is held in common between the cultures, but what is held in common between the myths, and that in its simplest archetypal forms.
Carl JungHow else could it have occurred to man to divide the cosmos, on the analogy of day and night, summer and winter, into a bright day-world and a dark night-world peopled with fabulous monsters, unless he had the prototype of such a division in himself, in the polarity between the conscious and the invisible and unknowable unconscious?
Carl JungUnfortunately, there can be no doubt that man is, on the whole, less good than he imagines himself or wants to be. Everyone carries a shadow, and the less it is embodied in the individual's conscious life, the blacker and darker it is. If an inferiority is conscious, one always has a chance to correct it
Carl Jung