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Zhao Jifu from Zhengding Prefecture was a man in his early thirties. In the fifth month of the Bingyin year of Zhiyuan, due to overwork and irregular diet, he injured his Spleen and Stomach. He frequently experienced irritability and thirst. Subsequently, excessive consumption of cold foods led to symptoms of physical fatigue, headache, cold limbs, vomiting, and fullness/oppression in the epigastrium (Xin Xia). The physician failed to examine the condition carefully; seeing the cold limbs, vomiting, and epigastric fullness, he administered three qian of Cinnamon Bark powder (Guixin), mixed with hot wine, and covered the patient with cotton clothes, treating it as Yin Toxin Cold Damage (Yin Du Shang Han). Shortly after, profuse sweating occurred. Following the sweat, new symptoms emerged: dry mouth, rough tongue, redness of the whites of the eyes, neck stiffness, lack of flexibility in the limbs, scanty dark urine, and constipation. The patient exhibited behaviors such as picking at clothes and touching the bed, resembling madness. When questioned, his speech was disordered. His tongue appeared bright red and cracked. The condition was mild in the morning and severe in the evening. This persisted for seven or eight days. His family believed he was critically ill and did not expect him to survive. A neighbor, Ji Zhongyuan, recommended me to treat him. I palpated his pulse, which beat six or seven times per respiration cycle, confirming that this was clearly a Heat syndrome. Therefore, I used Da Cheng Qi Tang (Major Order the Qi Decoction), a bitter, acrid, and greatly cold formula, one liang in dose, taken in one serving. The patient had three bowel movements, which checked the excess pathogenic factor. The next day, I prescribed Huang Lian Jie Du Tang (Coptis Decoction to Relieve Toxicity), a greatly bitter and cold formula, two liang in dose, to be taken slowly to eliminate residual heat. After three days, the illness had reduced by five or six parts out of ten. I then administered approximately half a jin of Bai Hu Jia Ren Shen Tang (White Tiger Decoction plus Ginseng) to clear heat and tonify Qi. All previous symptoms receded. I advised him to be cautious with daily activities and regulate his diet. Over more than a month, he gradually recovered. The Nei Jing states: "When using medicine, do not lose sight of the timing of heaven, do not go against the suitability of qi, do not assist the victory [of pathogens], and do not praise the recurrence [of pathogens]. This is called perfect treatment." It also says: "First determine the annual qi, and do not harm the harmony of heaven [natural bodily functions]." When summer heat qi is flourishing, the sages use cold and cool medicines to urgently rescue the source of Kidney Water and supplement the insufficiency of Lung Metal. Even if there is an invasion of exogenous cold damaging the body, Zhang Zhongjing would add herbs like Huang Qin (Scutellariae Radix), Zhi Mu (Anemarrhenae Rhizoma), and Shi Gao (Gypsum Fibrosum) within Ma Huang Tang (Ephedra Decoction). If jaundice or madness occurs, there are warnings against using Gui Zhi Tang (Cinnamon Twig Decoction). Moreover, the physician used Cinnamon Bark powder mixed with hot wine. This is what is meant by "a miss is as good as a mile" (a slight error leads to a huge mistake). This violates Zhang Zhongjing's therapeutic principles. The classics state: Do not harm Tian He (Heavenly Harmony), do not praise Fu Xie (Recurrent Pathogens), do not assist Sheng Xie (Victorious Pathogens), and do not lose Qi Yi (Suitability of Qi). Otherwise, the old disease will not cease, and new diseases will arise.