A complex is a cluster of energy in the unconscious, charged by historic events, reinforced through repitition, embodying a fragment of our personality, and generating a programmed response and an implicit set of expectations.
Carl JungThe shadow is a moral problem that challenges the whole ego-personality, for no one can become conscious of the shadow without considerable moral effort.
Carl JungWhen we must deal with problems, we instinctively resist trying the way that leads through obscurity and darkness. We wish to hear only of unequivocal results, and completely forget that these results can only be brought about when we have ventured into and emerged again from the darkness. But to penetrate the darkness we must summon all the powers of enlightenment that consciousness can offer.
Carl Jung