仲景论曰∶日数虽多，但有表证，而脉浮者，犹可发汗；日数虽少，若有里证，而脉沉实者，即须下之。是日
数之不可拘也如此。孙思邈曰∶服承气得利，谨勿中补。热气得补复成，此所以言实热也。王叔和有曰∶虚
热不可攻，热去则寒起，此所以言虚热也。二人之言，殊途同归。是虚实之不可辨也如此。又况寒、温、热，
同实而不同名。暑、湿、风，异种而有兼病。异气之相承，他邪之并作，表证中之有不可汗，里证中之有不
可下。三阴可温，而攻积证者不同。表里俱见，与半表半里无表里有异，伤寒、伤风，脉证互
见。中暑、热病，疑似难明。阳明本多汗，而有反无汗之形；少阴本无汗，而有反自汗之证。或阴极发躁，
阳极发厥，阴证似阳，阳证似阴，差之毫厘，谬以千里。又有痰证，食积、虚烦，香港脚，证
似伤寒，不可以伤寒之法拘之。自非心领意会。达变知机，体认之精，发用之当，则纵横泛应，几何而不
张仲景论述说：虽然患病天数很多，但只要还有表证，且脉象浮的，仍然可以使用发汗法；虽然患病天数很少，但如果出现里证，且脉象沉实的，就必须使用泻下法。由此可见，患病天数的多少是不可拘泥固定的。孙思邈说：服用承气汤（Chengqi Tang, 调胃承气汤、小承气汤或大承气汤的统称，具有泻热通便功效）后大便通畅得利，千万不要中途进补。因为热气如果得到补益会再次形成实热，这就是所说的实热的情况。王叔和说：虚热不可以用攻下法，如果攻下导致热邪去除，寒邪就会兴起，这就是所说的虚热的情况。这两人的言论，途径不同但归宿一致。由此可见，虚实之证的辨别是如此重要（注：原文“不可辨”在此语境下结合上下文“殊途同归”及临床意义，通常解读为需仔细辨别，或指表象迷惑难辨，此处依文意直译为“如此难以简单区分/需慎重辨别”，但在翻译中保留原文逻辑结构，意指二者观点互补，揭示了辨别的复杂性）。此外，寒邪、温邪、热邪，本质相同而名称不同。暑邪、湿邪、风邪，种类各异却常兼夹致病。异气相互承接，其他邪气同时发作，表证中有不可发汗的情况，里证中有不可泻下的情况。三阴病（Taiyin, Shaoyin, Jueyin diseases）可以用温法，但治疗积滞证候的方法各不相同。表证与里证同时出现，与半表半里证（Shao Yang syndrome）没有明显的表里区别是不同的；伤寒（Shanghan, Cold damage）与伤风（Wind strike）的脉象和症状互相交错。中暑（Heat stroke）与热病（Heat disease），症状相似难以明确区分。阳明病（Yangming disease）本应多汗，却有反而无汗的表现；少阴病（Shaoyin disease）本应无汗，却有反而自汗的症状。或者阴证极盛时出现烦躁（Ji Yin Fa Zao, extreme yin condition manifesting as restlessness），阳证极盛时出现四肢厥冷（Ji Yang Fa Jue, extreme yang condition manifesting as cold limbs），阴证似阳证，阳证似阴证，差错毫厘，结果谬以千里。又有痰证（Phlegm disorder）、食积（Food stagnation）、虚烦（Deficiency vexation）、香港脚（Hongjiao, 即脚气病，一种因湿气下注引起的下肢疾病），这些证候看似伤寒，不能用治疗伤寒的方法来拘泥限制。如果不是内心领会、意趣契合，通达变化、知晓机微，体认精准，运用得当，那么纵横应对各种情况，有多少不会出错呢？
Zhang Zhongjing stated: Although the number of days since onset is long, if there are still exterior symptoms (biao zheng) and the pulse is floating (mai fu), sweating therapy (fa han) may still be employed; although the number of days is short, if interior symptoms (li zheng) are present and the pulse is deep and excess (mai chen shi), purgative therapy (xia zhi) is required. Thus, the number of days cannot be rigidly adhered to. Sun Simiao said: After taking Chengqi Tang (Chengqi Decoction, a formula for purging heat and unblocking bowels) results in smooth bowel movement, do not administer tonification midway. If heat is supplemented, it will reconstitute as excess heat; this refers to excess heat (shi re). Wang Shuhe said: Deficient heat (xu re) must not be treated with attacking/purgative methods; if the heat is removed by such means, cold (han) will arise; this refers to deficient heat. The statements of these two individuals differ in approach but converge in conclusion. Thus, the distinction between deficiency and excess is complex. Furthermore, cold (han), warm (wen), and heat (re) pathogens share the same nature but have different names. Summerheat (shu), dampness (shi), and wind (feng) are distinct pathogens yet often cause combined diseases. Different pathogens may succeed one another, and other pathogenic factors may arise simultaneously. There are cases where exterior syndromes preclude sweating therapy, and interior syndromes preclude purgative therapy. The Three Yin syndromes (San Yin) can be treated with warming methods, but treating accumulation syndromes differs. Exterior and interior signs appearing together are distinct from Half-Exterior Half-Interior syndromes (Ban Biao Ban Li) which lack clear exterior-interior differentiation. Pulse and symptom presentations in Cold Damage (Shang Han) and Wind Strike (Shang Feng) interweave. Heat Stroke (Zhong Shu) and Heat Disease (Re Bing) are difficult to distinguish due to their similarity. Yangming disease (Yang Ming Bing) typically presents with profuse sweating, yet may paradoxically present without sweat; Shaoyin disease (Shao Yin Bing) typically presents without sweat, yet may paradoxically present with spontaneous sweating. Extreme Yin conditions may manifest as restlessness (Ji Yin Fa Zao), and extreme Yang conditions may manifest as cold limbs (Ji Yang Fa Jue). Yin syndromes may resemble Yang syndromes, and Yang syndromes may resemble Yin syndromes. A slight error leads to a massive deviation. Additionally, Phlegm disorders (Tan Zheng), Food Stagnation (Shi Ji), Deficiency Vexation (Xu Fan), and Hongjiao (Hongjiao, a disease characterized by lower limb swelling and weakness due to dampness) resemble Cold Damage but cannot be confined to the treatment principles of Cold Damage. Unless one comprehends through mind and intuition, understands change and opportunity, possesses precise recognition, and applies treatments appropriately, how could one handle diverse situations without error?