天不足西北，故西北方阴也，而人右耳目不如左明也。地不满东南，故东南方阳也，而
人左
手足不如右强也。东方阳也，阳者其精并于上，并于上则上明而下虚。故使耳目聪明，而手
足不便也。西方阴也，阴者其精关于下，并于下则下盛而上虚，故其耳目不聪明而手足便也
。故俱感于邪，其在上则右甚，在下则左甚。此天地阴阳所不能全也，故邪居之。故天有精
，地有形，天有八纪，地有五里，故能为万物之父母。清阳上天，浊阴归地，是故天地之动
静，神明之纲纪，故能以生长收藏，终而复始。惟贤人上配天以养头，下象地以养足，中傍
人事以养五脏。天气通于肺，地气通于嗌，风气通于肝，雷气通于心，谷气通于脾，雨气通
于肾。六经为川，肠胃为海，九窍为水注之气，以天地为之阴阳。阳之汗以天地之雨明之，
阳之气以天地之疾风名之，暴风象雷。逆气象阳，故治不法天之纪，不用地之理，则灾害至
矣。故邪风之至，疾如风雨。故善治者治皮毛，其次治肌肤，其次治筋脉，其次治六腑，其
次治五脏，治五脏者，半死半生也。故天之邪气感则害人五脏，水谷之寒热感则害于六腑，
地之湿气感则害皮肉筋脉。故善用针者，从阴引阳，从阳引阴，以右治左，以左治右，以我
知彼，以表知里，以观过与不及之理，见微则过，用之不殆。
Heaven's energy is insufficient in the northwest; therefore, the northwest belongs to Yin, and a person's right ear and eye are not as acute as the left. Earth's form is incomplete in the southeast; therefore, the southeast belongs to Yang, and a person's left hand and foot are not as strong as the right. The East belongs to Yang; the essence of Yang gathers upward. When it gathers upward, the upper part becomes clear and bright while the lower part becomes deficient. Thus, the ears and eyes are sharp, but the hands and feet are inconvenient. The West belongs to Yin; the essence of Yin gathers downward. When it gathers downward, the lower part becomes abundant while the upper part becomes deficient. Thus, the ears and eyes are not sharp, but the hands and feet are convenient. If both sides are affected by pathogenic factors, those affecting the upper part will be more severe on the right, and those affecting the lower part will be more severe on the left. This is where Heaven and Earth's Yin and Yang cannot be complete, so pathogens reside there. Heaven has essence, Earth has form; Heaven has eight seasonal markers, Earth has five regions; thus, they can serve as the parents of all things. Clear Yang ascends to Heaven, turbid Yin descends to Earth. Therefore, the movement and stillness of Heaven and Earth are the guidelines for divine spirit, enabling growth, flourishing, harvesting, and storage, ending and beginning again. Only the wise emulate Heaven above to nourish the head, emulate Earth below to nourish the feet, and follow human affairs in the middle to nourish the Zang organs (solid organs). Heavenly Qi connects with the Lung (Fei), Earthly Qi connects with the throat (Yi), Wind Qi connects with the Liver (Gan), Thunder Qi connects with the Heart (Xin), Grain Qi connects with the Spleen (Pi), and Rain Qi connects with the Kidney (Shen). The Six Channels (Liu Jing) are like rivers, the stomach and intestines are like seas, and the nine orifices are the passages for water Qi, using Heaven and Earth to correspond to the body's Yin and Yang. The sweat of Yang Qi is clarified by the rain of Heaven and Earth; the Qi movement of Yang is named after the swift wind of Heaven and Earth; violent winds resemble Thunder Qi; rebellious Qi resembles Yang Qi. Therefore, if treatment does not follow the laws of Heaven or utilize the principles of Earth, disasters will arrive. Thus, the arrival of pathogenic winds is as rapid as wind and rain. Therefore, a skilled healer treats at the level of the skin and hair first; next, at the level of muscle and skin; next, at the level of tendons and vessels; next, at the level of the Fu organs (hollow organs); next, at the level of the Zang organs. To treat the Zang organs means half death and half life. Thus, Heavenly pathogenic Qi harming the Zang organs, cold and heat from food and drink harming the Fu organs, and Dampness from Earth harming the skin, flesh, tendons, and vessels. Therefore, one skilled in acupuncture guides Yang from Yin, guides Yin from Yang, treats the left side via the right, treats the right side via the left, knows the other through oneself, knows the interior through the exterior, observes the principles of excess and deficiency, sees subtle signs to detect errors, and uses this without peril.