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Zhu Zhenheng, known as Master Danxi (Danxi Weng), was a native of Yiwu in Wuzhou. His surname was Zhu, his given name was Zhenheng, and his courtesy name was Yanxiu. Scholars revered him as Master Danxi. From childhood, he was fond of learning and could memorize thousands of characters daily. As he grew older, he studied the Classics under local scholars and engaged in the preparation for the imperial examinations. Later, hearing that Xu Wen Yi had acquired the teachings passed down through four generations from Zhu Xi (Master Zhu), and was lecturing on the Dao at Mount Bahuashan, he went to pay his respects. There, he further learned about the profound and subtle doctrines of morality and life-nature (Xingming), becoming a specialist in this field. One day, Xu Wen Yi said to him, "I have been bedridden for a long time; only a skilled physician can cure me. You are exceptionally intelligent; would you be willing to practice medicine?" Since Zhu's mother suffered from a spleen disorder and he had some rudimentary knowledge of medicine, upon hearing Xu's words, he replied generously, "If a scholar masters a skill to extend benevolence to all things, even if he does not serve as an official in his time, it is equivalent to serving." He then burned all his previous study materials for the imperial examinations and devoted himself entirely to medicine.

At that time, the two hundred and ninety-seven prescriptions compiled by Chen Shiwen and Pei Zongyuan in the *Daguan* era were prevalent. Zhu studied these prescriptions day and night. Soon, he realized, "Applying ancient prescriptions to contemporary diseases cannot fully fit the circumstances. If one wishes to establish standards, rules, and weights, one must rely on classics such as the *Suwen* (Plain Questions) and *Nanjing* (Classic of Difficult Issues). However, few physicians in our hometown know of these." Thus, he packed his bags and traveled to seek other teachers. He crossed the Zhe River, went to Wuzhong, passed through Wanling, reached Nanxu, and arrived at Jianye, but found no suitable mentors. Upon returning to Wulin, someone recommended Luo Zhi Ti to him. Luo, whose given name was Zhi Ti and courtesy name Zijing, was known as Master Taiwu. He was a eunuch during the reign of Emperor Lizong of Song, possessed exquisite medical skills, inherited the teachings of Liu Wansu (Liu Shouzhen) of the Jin Dynasty through two generations, and also understood the theories of Zhang Congzheng (Zihe Zheng) and Li Gao (Li Dongyuan). However, he had a narrow temperament, relied on his abilities, and disliked worldly affairs, making him difficult to please. Zhu visited him several times, but Luo refused to see him. Zhu persisted with greater determination, and Luo finally asked, "Are you not Zhu Yanxiu?" By then, Zhu already had a reputation in medicine, so Luo knew him. After meeting Luo, Zhu bowed facing north to formally become his disciple and accepted his teachings. Luo was pleased with Zhu and immediately taught him the books of Liu, Zhang, and Li, explaining their doctrines while emphasizing adherence to the classics, saying, "Abandon your old studies; they are incorrect." Zhu heard these words and felt enlightened, with no doubts remaining in his mind. After a short while, he mastered their learning and returned home. The local physicians, who were stuck in the teachings of Chen and Pei, were shocked, laughed, and rejected Zhu's views when they heard them. Only Xu Wen Yi was happy, saying, "My illness will surely be cured!" Xu suffered from gout (Jijibing) for over ten years without effective treatment. Zhu treated him using his methods with excellent results. Consequently, those physicians who had mocked and rejected him began to admire him silently and praise him verbally. Within a few years, his fame spread rapidly.

Not satisfied, Zhu further expanded upon the theories of Liu, Zhang, and Li. He believed that Liu and Zhang discussed six types of Qi transformations in the Zang-Fu organs, among which damp-heat and Minister Fire (Xianghuo) were the most common causes of disease. Therefore, he used methods to eliminate stale matter and promote new growth, and to purge fire, which indeed surpassed previous dynasties. However, for cases of Yin deficiency with fire hyperactivity, or simultaneous deficiency of both Yin and Yang, or excessive self-generated damp-heat, one must exercise discretion in treatment. He agreed with Li Gao's theory that dietary irregularities and overwork cause internal injury to the Spleen and Stomach, leading to the failure of Stomach Yang to ascend, causing Heart and Lung Qi to sink into the Middle Jiao. Thus, he used formulas to tonify the Middle and boost Qi, a method unprecedented by predecessors. However, Heaven is deficient in the northwest, and Earth is incomplete in the southeast. Heaven represents Yang, and Earth represents Yin. In people from the northwest, Yang Qi tends to descend; in people from the southeast, Yin Fire tends to ascend. If one ignores this and rigidly adheres to fixed methods, while diseases caused by descending Qi may be cured, applying the same to ascending Qi might worsen the condition. Therefore, Zhu integrated the strengths of the three schools, discarded their weaknesses, and incorporated the principles of Taiji (Supreme Ultimate), as well as concepts from the *I Ching* (Book of Changes), *Liji* (Book of Rites), *Tongshu*, and *Zhengmeng*. He connected these with the *Neijing* (Inner Canon) to find the ultimate meaning. He argued that the *Neijing*'s discussion of Fire aligns with the Taiji principle of movement generating Yang and the concept of the Five Natures being moved by external stimuli. Its mention of "Yin Pathways are Empty" resonates with the *Liji*'s idea of nourishing Yin. Based on this, he wrote *Discourse on Minister Fire* and *Discourse on Excess Yang and Insufficient Yin*.

In his *Discourse on Minister Fire*, he stated: Yang moves and transforms, Yin remains still and combines, giving rise to Water, Fire, Wood, Metal, and Earth. However, there are two types of Fire: Lord Fire (Junhuo) and Minister Fire (Xianghuo). Lord Fire is Human Fire; Minister Fire is Heavenly Fire. Fire is Yin inside and Yang outside, primarily governing movement. Thus, all movement belongs to Fire. In terms of nomenclature, based on form and substance generation and correspondence to the Five Elements, it is called Lord; in terms of position, arising from emptiness and receiving commands, it is called Minister. Heaven generates all things constantly through movement; human life also exists through constant movement. This constant movement is assisted by Minister Fire. Manifested in heaven, it appears as the Qi of Wood emerging from dragon thunder, and the Qi of Water emerging from the sea. In humans, it resides in the Liver and Kidney. The Gallbladder is the House of the Liver; the Bladder is the House of the Kidney; the Pericardium is the counterpart of the Kidney; the Sanjiao (Triple Burner) is named for its scorching nature, and the Lower Jiao governs the domains of the Liver and Kidney, all belonging to Yin and situated below. Heaven cannot generate without this Fire; humans cannot survive without it. Although Heavenly Fire originates from Wood, it is rooted in Earth. Thus, thunder cannot roar unless hidden, dragons cannot fly unless dormant, and seas cannot create waves unless attached to the earth. Roaring, flying, and creating waves are movements manifesting as Minister Fire. The Yin of the Liver and Kidney both possess Minister Fire, making humans identical to Heaven.

Someone asked: Minister Fire is shared by heaven and humanity; why did Li Dongyuan call it the thief of Yuan Qi (Original Qi)? He also said Fire and Yuan Qi do not coexist; when one wins, the other loses. How can one prevent this? I reply: Zhou Dunyi said, "Spirit manifests as consciousness. The Five Natures are moved by things, and all affairs arise. These five natures, when affected by external objects, cannot help but move." This movement is what the *Neijing* calls the Five Fires. Minister Fire is prone to movement; if the Jue-Yang Fire of the Five Natures fans the flames, it becomes erratic. Erratic Fire boils down True Yin; Yin deficiency leads to disease, and Yin exhaustion leads to death. Lord Fire is described in classics as Summer Heat and Dryness/Heat, whereas Minister Fire is simply called "Fire," indicating its violent and fierce nature exceeds Lord Fire. Hence, "Minister Fire is the thief of Yuan Qi." Zhou Dunyi said, "Sages establish correctness, justice, benevolence, and righteousness, focusing on Stillness." Zhu Xi also said, "One must ensure the Way Mind (Daoxin) is always master, while the Human Mind (Renxin) obeys it." This is how to properly manage Fire. When Human Mind obeys Way Mind and is governed by Stillness, the Five Fires remain motionless. Minister Fire then only assists creation and functions as the continuous process of life generation, thus not being a thief of Yuan Qi.

Someone asked: The *Neijing* commentary mentions Minister Fire regarding Shaoyin and Shaoyang, but not Jueyin and Taiyang. Why do you mention them? I reply: Li Dongyan mentioned Foot Taiyang and Foot Shaoyin, treating them with fried Phellodendron Bark (Huangbai) because its pungent flavor can purge Fire within Water. Zhang Zihe also stated that Gallbladder and Sanjiao, Liver and Pericardium, are all treated via Fire, referring to Dragon-Thunder Fire. My view that Heavenly and Human Fire both originate from Earth expands upon the ideas of these two gentlemen.

Someone asked: The *Neijing* discusses Fire in various contexts, often within the Six Qi, but rarely in relation to Zang-Fu organs. Did these two gentlemen have other sources? I reply: The classic states that all diseases arise from the pathogenic changes of Wind, Cold, Summer Heat, Dampness, Dryness, and Fire. Qibo listed nineteen pathogenesis items, five of which belong to Fire. Are these not manifestations of Minister Fire disease originating from Zang-Fu organs? Examining the *Neijing*: various heat disorders with confusion and convulsions belong to Fire; various manic and restless behaviors belong to Fire; various swellings, pain, soreness, fright, and terror belong to Fire. Furthermore, the *Yuan Bing Shi* states: various wind disorders with tremors and dizziness belong to Liver Fire movement; various wind disorders with stagnation and flaccidity belong to Lung Fire rising; various damp disorders with swelling and fullness belong to Spleen Fire excess; various painful, itching sores and ulcers belong to Heart Fire usage. All these show Fire diseases originating from Zang-Fu organs. Alas! Even Chen Wuye, despite his erudition, discussed Lord Fire as warmth and Minister Fire as daily fire, leading to the blindness of later generations.

In his *Discourse on Excess Yang and Insufficient Yin*, he stated: "Humans are born from the Qi of Heaven and Earth. Heaven's Yang Qi becomes Human Qi; Earth's Yin Qi becomes Blood." Yet Qi is often in excess, while Blood is often insufficient. Why? Heaven is vast, Yang, and moves outside Earth. Earth is within Heaven, Yin, and supported by Heaven's great Qi. The Sun is solid, Yang, and moves outside the Moon. The Moon is deficient, Yin, and derives its brightness from the Sun. Thus, Earth's Yin cannot overcome Heaven's Yang, and the Moon's Yin cannot rival the Sun's Yang. If Heaven, Earth, Sun, and Moon are like this, how much more so for humans! Humans are born; males reach seminal emission at sixteen, females begin menstruation at fourteen. After forming the body, they still depend on milk and grain for nourishment before Yin can match Yang to complete the human form and become parents. Ancients married around thirty or twenty, showing the difficulty of Yin maturation and the ancients' skill in preservation. Qian Zhongyang only tonified and never purged the Kidneys, understanding this intent. According to the *Liji* commentary: "Only after fifty does one need to intensify Yin nourishment." The *Neijing* says: "At forty, Yin Qi is halved, and daily activities decline." Males lose essence at sixty-four; females stop menstruating at forty-nine. Yin takes time to mature but is depleted early; one must know how to preserve it. The Classic says: "Yang is Heaven, governing the exterior; Yin is Earth, governing the interior. Thus, the Path of Yang is Solid, and the Path of Yin is Empty." Does this deceive us?

Someone asked: Having observed Heaven, Earth, Sun, Moon, and the male body, knowing there is excess and insufficiency, I understand. Humans exist in the intersection of Qi. How can we follow Yin-Yang principles for health preservation? I reply: The Kidney governs storage; the Liver governs free flow. Both contain Minister Fire, connected upward to the Heart, which is Lord Fire. Affected by external stimuli, it moves easily; when the Heart moves, Minister Fire follows. Sages teach restraining and nurturing the Heart, a profound intent. Heaven forms four seasons through the alternating rise and fall of the Five Elements. Human Zang-Fu organs correspond similarly. April (Si) and May (Wu) are associated with Fire. Fire controls Metal (Lung); when Fire is strong, Metal weakens. June (Wei) is Earth, strongly prosperous. Earth controls Water (Kidney); when Earth is strong, Water weakens. Moreover, Kidney Water relies on Lung Metal as Mother to supplement its deficiency. Ancients lived alone and ate bland food in summer, carefully preserving Metal and Water, avoiding the strength of Fire and Earth. The *Neijing* also says: "Those who store Essence in winter do not suffer from Warmth diseases in spring." October (Hai) and November (Zi) are times when Original Qi hides and stores, cultivating true nature for spring's emergence. If one indulges desires then, the root will be weak in spring, leading to disease.

Thus, Master Danxi's medical fame grew. Patients came from all directions, gathering like spokes on a wheel. He treated countless cases, recording symptoms, prescriptions, and outcomes clearly. For example, Zheng Yishi from Pujiang suffered from dysentery. One night, he fainted, eyes rolled back, with incontinence and sweating. Zhu diagnosed a chaotic, large pulse, stating, "This is sudden collapse of Yang due to Yin deficiency, likely caused by alcohol and intercourse after illness. I can cure it." He ordered Ginseng Paste and moxa points on Qihai. Soon, the patient's hand moved, then lips. After drinking three cups of paste, he revived. Taking several jin of paste cured him completely.

Zhou Jinshi from Tiantai suffered from aversion to cold, covering his head with cotton even in summer, taking hundreds of Aconite pills, worsening. Zhu diagnosed a slippery and rapid pulse, stating, "This is extreme heat presenting as cold." He used acrid-cool herbs to induce vomiting of phlegm, reducing the cotton cover. He prescribed Fangfeng Tongsheng San, curing him. Zhu warned, "After recovery, eat blandly to nourish Stomach Qi, and practice inner observation to nourish Shen. Otherwise, Aconite toxicity will erupt, likely fatal." The patient ignored this and died of carbuncle on the back.

The Pingzhang of Zhejiang Province, returning from southern campaigns, suffered from regurgitation. Physicians thought it curable. Zhu diagnosed the pulse and said, "Your condition is incurable." He told attendants privately, "This resulted from intercourse after shock. Fire and Wood pathogens combined, damaging Qi and fluids, drying intestines and stomach. Food enters but doesn't digest; Zang-Fu receive nothing. You will die in ten days." It happened as predicted.

A youth in Zheng's family fell ill with heat in early autumn, with thirst, delirium, and red cheeks. Physicians treated it as intense heat. Zhu diagnosed a weak and slow pulse, saying, "This is Warmth disease after overexertion. It should heal with tonics. Your pulses are forceful now due to cold medicines." He administered Fuzi Tang, curing him instantly.

The son of Censor Fu in Eastern Zhejiang suffered delirium and hallucinations, feared as demonic possession. Zhu diagnosed a deficient, wiry, deep, and rapid pulse, attributing it to drinking sour plum water in summer followed by severe fright. Fu confirmed this history. Zhu treated with phlegm-resolving and deficiency-tonifying herbs, curing him in ten days.

Chen Shishu, a villager, had abdominal distension like a bucket. Diuretics worsened it. Zhu diagnosed a rapid and choppy pulse, stating, "Caused by alcohol abuse, damaging Blood. Blood damage injures Spleen Yin. Stomach receives food but cannot transport, causing obstruction of Yang ascent and Yin descent." Chen admitted to hematuria from alcohol. Zhu used blood-tonifying herbs with success.

A powerful noble summoned Zhu for a minor ailment but behaved arrogantly. Zhu diagnosed the pulse, said nothing, and left. Investigating, Zhu said, "Your disease is terminal; you will die within three months. Do you still act arrogant?" He died as predicted.

An elderly man lost his sight. Zhu diagnosed a faint pulse and gave him Ginseng Paste, restoring his vision. Days later, Zhu saw a doctor preparing Mengshi (Fluorite) in the courtyard. The patient had taken it. Zhu exclaimed, "This disease is due to severe Qi deficiency. Instead of tonifying deficiency, you use heavy sedatives. He will die tonight." The patient died at midnight.

A man suffered urinary retention. Diuretics worsened it. Zhu diagnosed a wiry and slippery Right Cun pulse, stating, "Accumulated phlegm in the Lung. Lung is Upper Jiao; Bladder is Lower Jiao. Upper Jiao blockage causes Lower Jiao obstruction, like a water vessel needing the upper spout open for water to flow out." Zhu induced massive vomiting, curing him.

A woman fainted, screamed intermittently, and relapsed. Zhu diagnosed a wiry, rapid, and slippery Liver pulse, attributing it to anger and forced drinking after marital discord. She drank wine nightly to soothe her mood. Zhu treated with phlegm-draining and fire-purging herbs plus Cyperus (Xiangfu) to soothe Liver Qi, curing her instantly.

A woman hadn't eaten for half a year, lying facing north. Physicians gave up. Zhu diagnosed a Liver pulse extending beyond the Left Kou, stating, "Unrequited love causing Qi knot in Spleen." She had been married off to Guangzhou five years prior. Zhu told her father, "Anger can resolve this, as Anger's Wood energy breaks Earth knots." Zhu slapped her face three times, scolding her for improper thoughts. She cried and raged, then ate. Zhu then lied that her husband was returning soon. Three months later, the husband returned, and she recovered.

A postpartum woman had uterine prolapse. Physicians couldn't explain it. Zhu identified it as uterus descending due to Qi and Blood deficiency. He prescribed Astragalus and Angelica Sinensis with Cimicifuga to lift, and washed the area with Alum solution to tighten skin. The uterus retracted. He assured her she could bear children again in three years.

A poor widow suffered from leprosy. Zhu pitied her, noting that while usually incurable due to lack of discipline, her poverty prevented rich food and her widowhood prevented desire, making her treatable. He treated her personally. After recovery, he gave her Siwu Decoction hundreds of doses, preventing recurrence.

Zhu's medical practice was characterized by this approach. He adapted treatments to each case without rigidly adhering to ancient formulas, yet achieved accurate results. He was proficient in all schools' theories. While others strictly followed ancient rules, Zhu selected and discarded as needed, ultimately aligning with ancient wisdom. Students flocked to him, learning tirelessly.

Once, his student Zhao Liangren asked about the essence of Taiji. Zhu discussed the subtleties of Yin-Yang transformation and their connection to medicine, saying, "I have never discussed this deeply with students. Since you asked, I will share. This is teaching the Dao, not just medicine." Zhao told others, "Master Danxi's medicine originates here!"

Luo Chengzhi came from Jinling, claiming expertise in Zhang Zhongjing's teachings. Zhu said, "Zhang's works were compiled from fragments. Some texts are incomplete, meanings unclear, arrangements flawed, or principles inconsistent. I often find doubts." Zhu showed him several doubts, but Luo didn't understand. Later, Zhu treated a fever case due to Yin deficiency using Yin-nourishing and blood-tonifying herbs, curing it in three days. Luo sighed, "I would have treated this as Cold Damage. Using Xiong Gui (pungent-warm) for Yin deficiency is wrong, let alone sweating or purging methods!"

As Zhu aged, he complied with requests from Zhang Yi et al., writing *Gezhi Yulun* (Further Discourses on Investigating Things), *Jufang Fahui* (Elucidation of the Formulary), *Shanghan Biyi* (Clarifications on Cold Damage), *Bencao Yanyi Buyi* (Supplement to Extended Meaning of Materia Medica), and *Waike Jingyao Xinlun* (New Discussions on Essential Skills of Surgery). These works became standard texts for students.

Zhu was simple, honest, upright, and kind, strict and independent, holding correct intentions and sincere conduct. His filial piety and brotherly love were innate. He revised ritual texts for sacrifices with reverence; he cared for his mother according to seasonal needs with loyalty. He preferred scarcity for himself but abundance for his brothers; he favored his nephews over his own sons. He only befriended worthy men and followed the Dao. He passionately discussed historical gains and losses, worrying about the world. Famous people of the world...