A true symbol appears only when there is a need to express what thought cannot think or what is only divined or felt. - Carl Jung

I indignantly answered, “Do you call light what we men call the worst darkness? Do you call day night?”
To this my soul spoke a word that roused my anger, “My light is not of this world.”
I cried, “I know of no other world!”
The soul answered, “Should it not exist because you know nothing of it?

A more or less superficial layer of the unconscious is undoubtedly personal. I call it the "personal unconscious". But this personal layer rests upon a deeper layer, which does not derive from personal experience and is not a personal acquisition but is inborn. This deeper layer I call the "collective unconscious". I have chosen the term "collective" because this part of the unconscious is not individual but universal; in contrast to the personal psyche, it has contents and modes of behaviour that are more or less the same everywhere and in all individuals.

Nothing so promotes the growth of consciousness as [the] inner confrontation of opposites.