Jung on the Shadow: Part of human nature

Good does not become better by being exaggerated, but worse, and a small evil becomes a big one through being disregarded and repressed. The shadow is very much a part of human nature, and it is only at night that no shadows exist.

“A Psychological Approach to the Dogma of the Trinity” (1942) In CW 11: Psychology and Religion: West and East. P.286