Yuan Yin is kidney yin. Opposing Yuanyang is the essence of life, so it is called. Don't call it Tiangui. "The Complete Book of Jingyue" Volume 1: "Yuan Yin, that is, the invisible water, stands long and the sky is also." Kidney Yin is also called Yuan Yin, True Yin, Kidney Water and True Water. Not kidney yang. Refers to the yin fluid of the viscera (including the essence hidden in the kidney), which is attached to the kidney yang and is the material basis of the functional activities of the kidney yang. If the kidney yin is insufficient, the kidney yang will be excited, and even the fire will move wildly; Conversely, fire will burn kidney yin. Tiangui is another name for the original sound. "Jing Yue Quan Shu" records loyalty and righteousness: "Those who are invisible water, based on dragons, are precious."
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