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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: "To measure the unusual and the ordinary, the Dao lies in unity; grasping the essence of this unity allows one to know life and death." This is precisely the teaching of "refined unity and holding the mean" within the medical Dao. All studies concerning Heaven and humanity do not transcend this principle. Moreover, medicine as a discipline determines life and death in the span of a breath, and decides fortune or misfortune by the tip of the fingers (diagnosis and treatment). Its relationship to human life is more critical than any other matter. To bear such heavy responsibility, without such insight and understanding, it is indeed impossible to rely on guessing and experimentation, which would only harm living beings. Furthermore, establishing laws and transmitting teachings requires utmost seriousness; one cannot be casual. If a single statement is inappropriate, it may cause endless disaster; if a prescription is blindly administered, it will severely harm people. This is why errors and fallacies must not go uncorrected.

Since I began studying this path, I have often examined ancient texts. From Xuanyuan (Yellow Emperor) and Qibo downwards, whenever wise rulers and virtuous physicians emerged successively, which dynasty lacked them? However, if one seeks those who truly grasp the "mean," apart from the *Ling Shu* (Spiritual Pivot) and *Su Wen* (Basic Questions), there seem to be very few. I privately observe that transmitted formulas and theories often deviate from the original meaning of the classics, contradict their principles, and take passages out of context. Borrowing a few phrases to embellish one-sided, erroneous theories is common everywhere. This generally stems from incomplete insights and an unclear understanding of profound truths, leading individuals to display their own opinions to show off their strengths. Consequently, this discipline loses its balance, greatly violating the meaning of refined unity. What reliance can medicine offer to humanity under such circumstances? Does one not realize that the Dao originates from a single source, and truth has no dual directions? From one source arise ten thousand changes, yet these changes still return to unity; from dual directions arise confusion, leading to division into two. Thus, there is reason beyond words, and words beyond reason. For instance, when reason exists but words cannot express it, this is reason beyond words; when something can be spoken but not practiced, this is words beyond reason. But is there really separate speech beyond reason? Only when ambiguity is exploited with flattery does falsehood usurp truth, just as baseless arguments ("building walls by the roadside") have always existed. Consider the heterodox schools of Yang Zhu and Mo Di in ancient times, or legendary novels today; can they be said not to be words beyond reason? When words are borrowed falsely, right and wrong become confused, and strong辩论 (strong argumentation) arises. As a result, the wise become stubborn, and the foolish also become stubborn. Choosing goodness and adhering firmly to it is called "refined unity"; the gentleman maintaining appropriateness at all times is called "holding the mean"—this is the stubbornness of the wise. Conversely, those whose words are false yet eloquent, whose actions are perverse yet firm, who refuse to reflect and cannot be moved, exhibit the stubbornness of the foolish. Those who hold the mean speak up when they see errors because of the stakes involved; those who are perverse criticize others' strengths due to their own petty frustrations. Throughout history, right and wrong, orthodoxy and heresy, have often suffered from this. Moreover, among peers, it is difficult to find qualified individuals. Although these biased individuals still claim to follow reason, unlike those who submit blank papers (know nothing), there are still those within the field who completely ignore meridians and collaterals, knowing only superficial aspects, yet they boast loudly and cater to popular tastes. They merely apply cold remedies for heat signs, hot remedies for cold signs, dispersing methods for exterior syndromes, and resolving stagnation for fullness. Who does not know this? If doctors stop here, even humble and mediocre persons could serve as models, rendering the wisdom of the enlightened worthless. Alas! Alas! It is hard to distinguish cinnabar from purple (right from wrong); most are like this.

Therefore, tracing back to the sources and examining antiquity, since the Jin and Yuan dynasties, the figures revered as paradigms by the contemporary world were none other than Liu Wansu (Hejian) and Zhu Zhenheng (Danxi). Yet each held biased views, causing left-leaning theories to prevail, resulting in the medical Dao losing its balance for over four hundred years to date. Every time I read these works, I feel deeply frustrated. If we do not swiftly correct these errors, their detrimental effects will be endless. Here, I briefly excerpt a few points to demonstrate how absurd these claims are, showing that the unbelievable is similar to this, hoping to awaken people so that changing course is not difficult. If this can provide slight benefit to the future, I am willing to bear the blame of taboo-breaking for the sake of later generations.