《黄帝内经·素问·水热穴论》
岐伯回答说：肾属于至阴之脏，至阴属水，所以肾是主水的脏器。
岐伯对曰：肾者，至阴也。至阴者，盛水也。
Qi Bo replied: “The kidney is the ultimate yin organ, and the ultimate yin is water, so the kidney is the main organ associated with water.”