there is a fourth stage of consciousness which is extraordinary in the sense that most individuals experience it only rarely. This stage is most clearly illustrated when one gets a sudden insight into a problem—abruptly, seemingly from nowhere, pops up an answer for which one has struggled in vain for days. Sometimes such insights come in dreams, or at moments of reverie when one is thinking about something else: in any case, we know that the answer emerges from what are called subconscious levels in the personality. Such consciousness may occur in scientific, religious or artistic activity
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