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Reading Zhang Zhongjing's works, one should seek the intent behind his establishment of therapeutic principles. If one grasps this intent, one will know that his book serves as a standard for all generations, beyond which later generations cannot go and from which they cannot deviate. If one fails to grasp this intent, doubt and belief will mix, inevitably leading to understanding one aspect while being hindered by another. Alas! Since Zhang Zhongjing, those who have elucidated his work are countless, yet it has never been heard that anyone has explicitly highlighted and demonstrated the intent behind his establishment of principles. Is it because they sought but could not find? Or do they follow habit without seeking? Or perhaps such works exist but I have not seen them? Although I am not intelligent, let me present my view.

Exposure to cold pathogens results in two types: those that manifest immediately (Ji Bing) and those that do not. Immediate manifestation occurs at the time of pathogen acquisition; delayed manifestation occurs after a period of time, during spring and summer. Immediate manifestation is termed "Shanghan" (Cold Damage); delayed manifestation is termed "Wenbing" (Warm Disease) and "Shubing" (Summerheat Disease). Although Shanghan, Wenbing, and Shubing differ in category, their original source of pathogenic acquisition is identical. Because the source is identical, they are collectively referred to as "Shanghan"; because the categories differ, treatments must not be confused. Confusing treatment based on nomenclature would surely harm future generations, causing them to blame Zhang Zhongjing's methods and discard more than half of them. Alas! If Zhang Zhongjing's methods truly harmed future generations, *Shanghan Lun* need not have been written. If they did not harm future generations, how could *Shanghan Lun* be missing even for a day? Yet later generations blame the Great Sage who established the laws rather than their own lack of insight. This is like falling into a well and blaming Boyi (the inventor of digging wells), or suffering fire and blaming Suiren (the inventor of drilling wood for fire).

Zhang Zhongjing's methods are the ancestor for posterity. Even when facing difficulties and changes, later generations ultimately cannot transcend his rules. From this inability to transcend, can his methods and formulas really be discarded by half? Nevertheless, scholars who write books to instruct others still make mistakes here; mediocre individuals are hardly worth criticizing. Only scholars leave traces in their writings. Mediocre individuals, after hesitating, may blindly follow orders, eager to see simplified versions. Their methods and formulas are discarded by half without return, pursuing only simplicity. This is why people lack reliance, and Zhang Zhongjing's true intent remains unclear.

Alas! The laws and formulas were specifically established by Zhang Zhongjing for immediate Shanghan, not jointly for delayed Wenbing and Shubing. If later generations knew that Zhang Zhongjing's book was designed for immediate cases, not delayed ones, they would regret that few methods remain scattered and insufficient to counter the myriad errors of incompetent physicians. Would they dare abandon them due to trouble? Thus, discarding half without realizing the error stems from failing to understand the intent behind establishing the principles. Today, using Shanghan methods to treat Wenbing and Shubing is merely borrowing, not the original intent. It is like the use of borrowed characters in Chinese script; although used when exhausted, it is not the original intent of character creation.

Zhang Zhongjing's principles are the balance for the world and future generations, so they can be borrowed for other diseases. However, is it only for Wenbing and Shubing? Treatments for miscellaneous diseases can also borrow from these principles. People today, seeing that Shanghan methods can treat Wenbing and Shubing, assume these laws apply universally to Shanghan, Wenbing, and Shubing. Are these not those who know the stream but ignore the source? If you do not believe me, let me prove it. In Zhang Zhongjing's book, cold syndromes of the Three Yin meridians account for 70-80% of heat syndromes. Delayed Wenbing and Shubing are purely heat syndromes; how can they become cold? Examining the cold syndromes of the Three Yin meridians closely reveals my words are not false. Some argue that Three Yin cold syndromes are actually miscellaneous diseases added by Wang Shuhe, or that the coldness resulted from misusing cold medicines. These views are incorrect. Wang Shuhe added only chapters like *Bian Mai*, *Ping Mai*, *Ke Han*, and *Ke Xia*. The Six Meridian Disease chapters were certainly not tampered with by him. However, in the Jueyin chapter, items regarding diarrhea, vomiting, and hiccups were indeed attached by Wang Shuhe due to the presence of limb coldness, including similar cases without limb coldness. Regarding changes caused by medication errors, Taiyin is most affected. Even if some Three Yin syndromes became cold due to cold medicine errors, could they be so numerous?

Because later generations believed Zhang Zhongjing's book applied to both Shanghan and Wenbing/Shubing, all warm-tonic medicines were suspected and unused. Han Zhihe felt Guizhi Tang (Cinnamon Twig Decoction) was difficult to use but attributed it to changing times, failing to realize the book was for immediate Shanghan. His book *Weizhi* treats Wenbing and Shubing as Shanghan, ignoring immediate Shanghan. This is abandoning the root for the branch, completely missing Zhang Zhongjing's scope. He viewed symptoms before Summer Solstice—chest fullness, vomiting, qi obstruction, intestinal rumbling, abdominal pain, body stiffness, and cold limbs—as Wenbing/Shubing, claiming they share pulse logic but differ in symptoms from Zhang's Three Yin cold syndromes, thus creating a "Warming Middle" method. Zhang's Three Yin cold syndromes describe winter immediate Shanghan. Applying these to spring/summer Wenbing/Shubing is erroneous.

Although Han Zhihe missed the original intent and was confused during a Wenbing/Shubing outbreak, his symptoms of chest fullness, vomiting, and cold qi likely stem from internal injury from cold food, exposure to violent cold, overuse of cold medicines, or dual internal/external cold injury. Han only stated "cold requires warming" without investigating the cause. Investigating the cause reveals Wenbing/Shubing inherently lack cold syndromes.

Regarding "Yindu" (Yin Toxin) in Zhang's book, the described symptoms are only blueish face, body pain like being beaten, and sore throat, lacking signs of extreme yin-cold. The formulas used (Shengma Gancao Danggui Biejia Tang) contain no strongly warm/hot herbs. Thus, Zhang's "Yindu" refers to toxic qi entering Yin meridians, not an yin-cold disease. Later commentators equated Yindu with extreme yin-cold, citing Zhang's symptoms but treating with Fuzi San (Aconite Powder) or Zhengyang San, which is incorrect. Later descriptions of Yindu involve internal cold injury or external cold, not toxic qi.

Zhu Fenyi's *Huo Ren Shu* elucidates *Shanghan Lun* greatly. He recognized that Shanghan directly entering Yin meridians causes cold syndromes, unlike others. However, he failed to realize Zhang's laws were for immediate cases, mixing Shanghan, Wenbing, and Shubing discussions. He combined secondary transmission heat syndromes with direct entry cold syndromes, stating Yangming requires purgation and Shaoyin requires warming. This contradicts himself: if Shaoyin involves transmitted heat, can it be warmed? Shaoyin in Warm/Sun diseases especially cannot be warmed. Zhu's theory caused harm.

Cheng Wuji's commentary praised terminology meticulously but failed to recognize direct Yin cold syndromes as well as Zhu, let alone the original intent. Consequently, he merely explained texts without clarifying why Three Yin syndromes are cold rather than hot.

Liu Shouzhen also treated Wenbing/Shubing as Shanghan, omitting immediate Shanghan. His acrid-cool dispersing formulas addressed confusion between wind-stroke and Shanghan, reflecting doubts about Guizhi/Mahuang Tangs. Due to this doubt, he missed the specific indications and timing for Zhang's formulas. In *Yuan Bing Shi*, he claimed using Mahuang/Guizhi in summer requires adding cold herbs to prevent jaundice or macules. This view originated from Pang Anchang and was echoed by Zhu. Zhang established Mahuang/Guizhi Tangs not for summer heat. Understanding that these are not for Wenbing/Shubing dispels doubts. Cold initially blocking pores traps yang heat, requiring acrid-warm herbs to open pores (Mahuang Tang). Wind damaging the surface loosens pores but injures righteous qi, causing fever; acrid-sweet-warm herbs disperse evil and close pores (Guizhi Tang). No cold herbs were added because wind/cold is on the surface during cold weather.

Later generations, unaware of the intent, feared the heat of Mahuang/Guizhi in spring/summer, suggesting adding cold herbs. This misunderstanding led to unnecessary modifications. If Zhang prescribed for Wenbing/Shubing, he would have different methods, now lost. Knowing *Shanghan Lun* is for immediate Shanghan clarifies the use of Mahuang/Guizhi. Except for transmitted heat, direct Yin injuries and non-heat-trapped Taiyang transmissions have clear indications, removing suspicion of cold-medicine-induced changes.

Spring/summer aversion to wind/cold resembling Shanghan are new wind-cold attacks, not delayed winter injuries. Alternatively, Wenbing/Shubing onset triggered by wind-cold, or wind-cold stirring long-standing heat. Zhang states: "Taiyang disease, fever with thirst and no aversion to cold is Wenbing." Thus, Wenbing features thirst, not aversion to cold. Aversion without thirst is not Wenbing. Shubing is similar to Wenbing but more severe after time. Spring/summer aversion to wind/cold does not justify light use of Guizhi/Mahuang Tangs; do not cling to "dispersing outward is not far from heat." Acrid-cool dispersal is appropriate. Reckless use causes mania, macules, jaundice, or epistaxis without efficacy. Occasional success in spring/summer is accidental due to acrid-sweet dispersion; do not treat as norm. Modern use of Baidu San, Sushu Yin, etc., for all seasons is flawed but less harmful than reckless Mahuang/Guizhi use. However, these formulas only treat acute wind-cold in spring/summer, not delayed Wenbing/Shubing. Using them then is harmful. Effectiveness is accidental. One must distinguish necessity from accident in treatment. Mistaking accident for necessity leads to persistent errors and patient suffering.

Zhang uses warm medicines for Three Yin because the condition requires it and timing is correct. Discarding Three Yin cold syndromes as miscellaneous diseases betrays Zhang's benevolence. Recent scholars emphasize cold/cool therapies, neglecting warm/hot agents, causing hesitation toward Zhang's book. Some discard it, claiming ancient laws don't fit modern "fire" eras. This is false. Recognizing Zhang's focus on immediate cases validates Guizhi/Mahuang and warm agents. If Zhang's laws covered all seasonal diseases, would *Shanghan Lun* formulas treat epidemic cold, warm malaria, etc.? *Shanghan Li* states Winter Warmth differs from Shanghan. Han Yi resembles Warmth/Summerheat but differs in treatment. Thus, Zhang had distinct methods for these, now lost. *Suwen* states cold injury leads to heat (norm); Zhang covers both norm and variation. Zhang added to ancient knowledge; discarding him is unjustified.

Wang Shuhe compiled Zhang's scattered works, a great merit. But mixing his own theories and miscellaneous pulse/disease chapters at the beginning confused value and obscured authorship. Had he separated Zhang's text from his own notes, confusion would be avoided. Like Han scholars editing Qin remnants, Wang may face criticism. I intended to reorganize the book: *Shanghan Li* first, then Six Meridians, Similar Diseases, Post-illness Care, Diagnosis, Methods, Contraindications, Errors, Resolution, Unresolved, followed by relevant miscellaneous pulses/diseases, deleting irrelevant ones. This would clarify laws and separate truth from falsehood. Lacking time, I record this for future revision.