It is important to have a secret, a premonition of things unknown. It fills life with something impersonal, a numinosum. A man who has never experienced that has missed something important. He must sense that he lives in a world which in some respects is mysterious; that things happen and can be experienced which remain inexplicable; that not everything which happens can be anticipated. The unexpected and the incredible belong in this world. Only then is life whole.
C.G. Jung from Memories, Dreams, Reflections