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To be small means there is no inside; to be large means there is no outside.  The phenomenal expressions of increase and reduction, rejection and acceptance, opposition and reversion, are all controlled by yin and yang.  Yang is mobile and active, yin is still and unobtrusive.  When yang emerges in activity, yin accordingly goes into concealment.  When yang comes to an end, it returns to the beginning, yin; and when yin reaches a climax, it reverts to yang.
--The Master of Demon Valley.  pg. 7