黄帝在明堂，雷公请曰∶臣授业传之，行教以经论，从容形法，阴阳刺灸，汤药所滋。行治有贤不肖，
未必能十全。若先言悲哀喜怒，燥湿寒暑，阴阳妇女，请问其所以然者，卑贱富贵，人之形体所从，群下通使，
临事以适道术，谨闻命矣。请问有HT 愚仆漏之问，不在经者，欲闻其状。帝曰∶大矣。公请问∶哭泣而泪不
出者，若出而少涕，其故何也？帝曰∶在经有也。复问∶不知水所从生，涕所从出也。帝曰∶若问此者，
无益于治也，工之所知，道之所生也。夫心者，五脏之专精也，目者其窍也，华色者其荣也，是以人有德也，
则气和于目，有亡，忧知于色。是以悲哀则泣下，泣下水所
由生。水宗者积水也，积水者至阴也，至阴者肾之精也。宗精之水所以不出者，是精持之也，辅之裹之，故水
不行也。夫水之精为志，火之精为神，水火相感，神志俱悲，是以目之水生也。故谚言曰∶心悲名曰志悲。
志与心精，共凑于目也。是以俱悲则神气传于心精，上不传于志而志独悲，故泣出也。泣涕者脑也，脑者阴也，
髓者骨之充也，故脑渗为涕。志者骨之主也，是以水流而涕从之者，其行类也。夫涕之与泣者，譬如人之
兄弟，急则俱死，生则俱生，其志以早悲，是以涕泣俱出而横行也。夫人涕泣俱出而相从者，所属之类也。
雷公曰∶大矣。请问人哭泣而泪不出者，若出而少，涕不从之何也？帝曰∶
夫泣不出者，哭不悲也。不泣者，神不慈也。神不慈则志不悲，阴阳相持，泣安能独来。夫志悲者惋，惋则冲
阴，冲阴则志去目，志去则神不守精，精神去目，涕泣出也。且子独不诵不念夫经言乎，厥则目无所见。夫
人厥则阳气并于上，阴气并于下。阳并于上，则火独光也；阴并于下，则足寒，足寒则胀也。夫一水不胜五火，
故目 盲。是以冲风，泣下而不止。夫风之中目也，阳气内守于精，是火气燔目，故见风则泣下也。有以比之，
夫火疾风生乃能雨，此之类也。
阴阳类论∶ （音廉）
方盛衰论∶菌（祛伦切）
解精微论∶HT （士衔切）凑（粗勾切）
Huangdi was in the Mingtang (Bright Hall), and Leigong asked respectfully: "I have received instruction and transmitted it, teaching according to the classic treatises, calmly studying forms and methods, Yin-Yang acupuncture and moxibustion, and the nourishing effects of herbal decoctions. In treatment, there are distinctions between the virtuous/capable and the incompetent, and perfection is not always achieved. If one first discusses sorrow, anger, joy, dryness, dampness, cold, heat, Yin-Yang, and women's diseases, asking for their causes, involving status of lowly or noble, the origin of human physique, and the communication of subordinates, adapting to the Daoist arts in practice, I have listened with reverence. Now I wish to ask some foolish and trivial questions that are not recorded in the classics, and I desire to hear their descriptions." Huangdi said: "This is significant." Leigong then asked: "When crying, tears do not flow out, or if they flow out, there is little mucus; what is the reason?" Huangdi said: "This is recorded in the classics." Leigong asked again: "I do not know where water originates, nor where mucus comes from." Huangdi said: "Asking such questions is of no benefit to treatment; this is knowledge known to craftsmen, from which the Dao arises. The Heart is the essence of the Five Zang organs, the eyes are its orifices, and the luster of the complexion is its glory. Therefore, when a person possesses virtue, harmonious Qi flows into the eyes; if there is deficiency, sorrow manifests in the complexion. Thus, sorrow leads to weeping, and tears originate from this. The source of water is accumulated water; accumulated water belongs to Extreme Yin; Extreme Yin is the Essence of the Kidney. The water of the Zong Essence does not flow out because it is held by the Essence, assisted and wrapped by it, so the water does not move. The essence of Water lies in Zhi (Will/Intent), and the essence of Fire lies in Shen (Spirit). When Water and Fire interact, and both Shen and Zhi feel sorrow, water is produced in the eyes. Hence the proverb says: 'Heart sorrow is called Zhi sorrow.' Zhi and Heart Essence gather together at the eyes. Therefore, when both feel sorrow, Shen Qi transmits to the Heart Essence; if it does not transmit to Zhi and only Zhi feels sorrow alone, then tears flow. Mucus and tears belong to the Brain; the Brain is Yin; Marrow fills the bones; thus, brain leakage becomes mucus. Zhi is the master of the bones; therefore, as water flows, mucus follows them, as their movement patterns are similar. Mucus and tears are like brothers; in urgency, they die together; in life, they live together. Because Zhi grieves early, mucus and tears flow out together and spread horizontally. When mucus and tears flow out together and follow each other, it is because they belong to the same category."
Leigong said: "Very profound. I ask: when a person cries but tears do not flow out, or flow out sparingly, and mucus does not follow, what is the reason?" Huangdi said: "Whether tears flow depends on whether the crying is heartfelt. If tears do not flow, it is because Shen is not compassionate. If Shen is not compassionate, Zhi is not sorrowful. Yin and Yang hold each other in balance; how can tears come alone? When Zhi is sorrowful, it feels suppressed; suppression impacts Yin; impacting Yin causes Zhi to leave the eyes; when Zhi leaves, Shen cannot guard the Essence; when Spirit and Essence leave the eyes, mucus and tears flow. Moreover, have you not read and reflected upon the classic statements? Jue syndrome causes blindness in the eyes. When a person suffers from Jue syndrome, Yang Qi gathers in the upper part, and Yin Qi gathers in the lower part. Yang gathering above means Fire shines alone; Yin gathering below means cold feet; cold feet lead to abdominal distension. One Water cannot overcome Five Fires, hence the eyes become blind. Therefore, when encountering wind, tears flow incessantly. When Wind pathogen invades the eyes, Yang Qi is internally guarded within the Essence; this is Fire Qi burning the eyes, hence tears flow upon seeing wind. This can be compared to other phenomena: intense fire and strong wind generate rain; this is of the same category."
Yin Yang Lei Lun: (pronounced Lian)
Fang Sheng Shuai Lun: Jun (cut sound Ru Lun)
Jie Jing Wei Lun: HT (cut sound Shi Xian) Cou (cut sound Cu Gou)