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The *Treatise on Investigating the Four Errors* states: Failing to understand the principles of Yin-Yang and their reversal or compliance during diagnosis is the first error in treatment. If one has not completed their apprenticeship, yet recklessly employs miscellaneous techniques, falsely presenting erroneous statements as the Dao, changing names to claim credit for oneself, and improperly using Bian stones (stone acupuncture), thereby leaving aftereffects and blame upon the body, this is the second error in treatment. If one fails to consider the patient's living conditions according to their wealth or status, the thickness or thinness of their seating/sleeping arrangements, the warmth or coldness of their physique, the suitability of their diet, and whether they are courageous or timid, and does not know how to apply comparative analysis (Bilei), one will sufficiently confuse oneself and fail to clarify the condition; this is the third error in treatment. When diagnosing a disease, if one does not inquire about the initial causes—such as emotional distress from worries, dietary irregularities, excessive daily activities, or exposure to toxins—and instead hastily palpates the Cun Kou (Inch Position) pulse without addressing these factors, how can one accurately identify the disease? To fabricate disease names recklessly and be trapped by crude medical practices constitutes the fourth error in treatment. (The first error is ignorance of the principles of Yin-Yang reversal and compliance. These principles are manifold: The Ren Ying pulse at the left hand belongs to Yang; a洪大 (Hongda, surging and large) pulse is compliant in Spring and Summer, while a 沉细 (Chenxi, deep and fine) pulse is reversed. For external contraction Yang diseases, appearing with a Yang pulse is compliant, while a Yin pulse is reversed. The Qi Kou pulse at the right hand belongs to Yin; a Chenxi pulse is compliant in Autumn and Winter, while a Hongda pulse is reversed. For men, a large pulse at the left hand is compliant; for women, a large pulse at the right hand is compliant. For Yang diseases, appearing with a Yin pulse is compliant, while a Yang pulse is reversed; for Yin diseases, appearing with a Yang pulse is compliant, while a Yin pulse is reversed. Additionally, the appearance of facial colors at specific locations (upper/lower, left/right) has its key significance: upper is reversed, lower is compliant; for women, right is reversed and left is compliant; for men, left is reversed and right is compliant. The second error is failing to receive orthodox teachings from a master and blindly imitating heterodox miscellaneous techniques, treating the incorrect as correct, and arbitrarily using Bian stones. The third error is failing to adapt to the specific circumstances of the patient and not understanding the meaning of comparative analysis. The fourth error is failing to investigate the original cause of the illness, recklessly palpating the Cun Kou pulse, missing the actual condition, and falsely naming the disease.)

The *Treatise on Yin-Yang Categories* states: The Three Yang meridians serve as the main channels (Jing), the Two Yang meridians serve as the maintenance (Wei), and the One Yang meridian serves as the roaming department (Youbu); through this, one can understand the termination of the Five Zang organs. The Three Yang are exterior, the Two Yang are interior, and when the One Yin reaches its extremity, it acts like the alternation of the new moon (Shuo) and the last day of the lunar month (Hui); turning back to combine with the correct principle establishes its law. (This refers to the Six Meridians as the exterior and interior of the human body, regarding Taiyang and Taiyin as noble. "Three Yang" refers to the Foot-Taiyang Bladder Meridian. It starts from the inner canthus, ascends to the head dividing into four paths, descends the neck combining with main and collateral branches into six paths, running along the back, serving as the great channel of the body. "Two Yang" refers to the Foot-Yangming Stomach Meridian. It starts from the nose, descends to the throat, divides into four paths, combines with main and collateral branches into six paths, running up and down the abdomen, serving as the maintenance of the body. "One Yang" refers to the Foot-Shaoyang Gallbladder Meridian. It starts from the outer canthus, connects to the head, divides into four paths, descends to the Clavicular Fossa (Quepen), combines with main and collateral branches into six paths, running up and down as the roaming part of the body. Being called Jing, Wei, and Youbu allows one to know the termination of the Five Zang organs, relying on these three meridians as the exterior. Thus, since the Three Yang are the exterior of the body, the Two Yin are its interior; the Two Yin refers to the Foot-Shaoyin Kidney Meridian. Since the Two Yin are the exterior, the Three Yin are its interior; the Three Yin refers to the Foot-Taiyin Spleen Meridian. Since the One Yang is the exterior, the One Yin is its interior; the One Yin refers to the Foot-Jueyin Liver Meridian. Taiyin is the Principal Yin, followed by Shaoyin, then Jueyin. Taiyang is the Principal Yang, followed by Shaoyang, then Yangming. Because their Qi amounts and functions differ, they are divided into three categories each. However, the meanings of Shaoyin and Taiyin are easy to understand, while those of Yangming and Jueyin are difficult to explain. The twelve Foot meridians correspond to the twelve months. Therefore, the Yin month (1st month) represents the generating Yang of Zhengyue, governing the Left-Foot Shaoyang. The Wei month (6th month) corresponds to the Right-Foot Shaoyang; both are where the Qi of the fourth toes runs. The Mao month (2nd month) governs the Left-Foot Taiyang; the Wu month (5th month) corresponds to the Right-Foot Taiyang; both are where the Qi runs above the little toe on the lateral side. The Chen month (3rd month) governs the Left-Foot Yangming; the Si month (4th month) corresponds to the Right-Foot Yangming; both are where the Qi runs above the second toe. However, the 1st, 2nd, 5th, and 6th months are Shaoyang and Taiyang, while the 3rd and 4th months are Chen and Si, situated in between; with two Yangs combining and brightening before them, it is called Yangming. The Shen month (7th month) governs half the generation of Yin, generating the Right-Foot Shaoyin; the Chou month (12th month) corresponds to the Left-Foot Shaoyin; both are where the Qi runs above the soles of the feet. The You month (8th month) governs the Right-Foot Taiyin; the Zi month (11th month) corresponds to the Left-Foot Taiyin; both are where the Qi runs above the medial side of the big toe. The Xu month (9th month) governs the Right-Foot Jueyin; the Hai month (10th month) corresponds to the Left-Foot Jueyin; both are where the Qi runs above the lateral side of the big toe. However, the 7th, 8th, 11th, and 12th months are Shaoyin and Taiyin, while the 9th and 10th months are Xu and Hai, indicating that the Yin of both feet is exhausted. Correspondingly, in the Xu and Hai months, One Yin is nearly extinct. But who knows that when One Yin reaches extinction, there is a principle of re-generation? The wonder of Shuo and Hui相生 (mutual generation) lies within. Essentially, Yin exhaustion is Hui (darkness/new moon eve), Yin generation is Shuo (new moon); Qi exhaustion is Hui, Qi generation is Shuo. Having seen the Hui, one also sees the Shuo. The extinction of Jueyin and its subsequent re-combination should be corrected by the wonder of Shuo and Hui. "Zheng" (Correct) means "Zheng" (Evidence/Proof).) The Three Yang are like fathers, the Two Yang are like guards (Wei), and the One Yang is like the discipline (Ji). The Three Yin are like mothers, the Two Yin are like females (Ci), and the One Yin is like the sole messenger (Dushi). (The Three Yin refers to Taiyin. Taiyin is the channel of the exterior, covering and protecting all living beings, noble like a father. The Two Yang refers to Yangming. Yangming is the maintenance of the exterior, defending various parts, thus called Wei (Guard). The One Yang refers to Shaoyang. Shaoyang is the roaming part of the exterior, distributing collaterals to various meridians, thus called Ji (Discipline). The Three Yin refers to Taiyin. Taiyin is the channel of the interior, nourishing various meridians, noble like a mother. The Two Yin refers to Shaoyin. Shaoyin is the maintenance of the interior, where life begins, thus called Ci (Female). The One Yin refers to Jueyin. Jueyin is the roaming part of the interior, where generals plan and deliberate, thus called Dushi (Sole Messenger).)