"How else could it have occurred to man to divide the cosmos, on the analogy of day and night, summer and winter, into a bright day-world and a dark night-world peopled with fabulous monsters, unless he had the prototype of such a division in himself, in the polarity between the conscious and the invisible and unknowable unconscious?"

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Analogies and metaphors have often proved pivotal in expanding our thoughts both within and without science, and so one should not discourage the attempt to synthesize apparent opposites. However, citizens of the New Age often forget that, when they involve science, analogies should be tempered by experiment and calculation.

— Tony Rothman