Knowing our own darkness is the best method for dealing with the darkness of others. - Carl Jung
I like the way Robert Bly describes this, as a black bag we are all dragging around behind us. The darkness, or unconscious (the black bag) holds our wounds. The wounds are key to our healing. I've never personally met someone without wounds and the most conscious people I have met, have done extensive work on healing and integrating what is in their black bag. The most fascinating part about the darkness or the black bag, is that we aren't usually aware of what is inside until we look. And yet, the contents of that bag are contributing to our reality and the experiences we are having in our lives.