Shadows

I just heard a discussion about Carl Jung that really interested me. I have learned a bit about Carl Jung in the past, but yesterday's reference pertained to his definition of "Shadows." Essentially a Shadow is the dark side of human nature that people wish to cover up and hide. The quote that was read was "beware of being so close to the brightest light, for it casts the largest shadow."
Does anyone know the actual quote from Jung, maybe with citation?
As I chew on this idea, I believe it will quickly develop into a larger post.

Tags: psychology