It is, in fact, one of the most important tasks of psychic hygiene to pay continual attention to the symptomatology of unconscious contents and proce… - Carl Jung

...the mind that is collectively orientated is quite incapable of thinking and feeling in any other way than by projection.

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.

In studying the history of the human mind one is impressed again and again by the fact that the growth of the mind is the widening of the range of consciousness, and that each step forward has been a most painful and laborious achievement. One could almost say that nothing is more hateful to man than to give up even a particle of his unconsciousness. Ask those who have tried to introduce a new idea!