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"Great perfection appears lacking (ch'üeh), Its use is unending. Great fullness appears empty, Its use is inexhaustible. Great straightness appears bent, Great ingenuity (ch'iao) appears crude, Great eloquence (pien) appears inarticulate. When agitation (tsao) wins (sheng), the cold arrives, When tranquillity (ching) wins (sheng), the hot arrives. Clear and tranquil the world is in the right mode (cheng)."