一、医籍浩如烟海，求其搜罗赅备，分析详明，莫如《准绳》一书。兹编务期简括，俾观者豁目爽心，
故径途各出。
一、仲景《伤寒》，宜参各家辨论，兹但取《医学心悟》数条，不能备载。
一、春温夏热两症，多伏气伤寒，邪从肾出，此即经所云∶冬伤于寒，春必病温，冬不藏精，春必病
温者也。与口鼻吸入之邪，伏于募原，浅深异治，学人当分别观之。
一、时疫症张景岳既失之温补，吴又可又但主急下。《张氏医通》揭明地气郁蒸一义，最宜参究。
一、香岩叶先生所传《临症指南》，案随诊立，不暇修饰。然如脾脏胃腑，历来混治，先生独因经旨，
喜燥喜凉，悟出脏主守、腑主通二义。论东垣补中益气治在脾，仲景急下存阴治在胃，何等超妙！即如不食一
症，粗工但知燥脾，愈燥愈结，先生独议养胃阴，遵治辄验，此类皆素所服膺。
一、肝风眩晕，与类中风相近，原可并为一门，兹根据《指南》例，另为拈出，意在醒目。
一、目、喉、乳俱系专科，病症治法繁琐，不能备辑，兹但撮其要。
一、各症宗经立论，酌古用方，列纲分目，皆层层推勘而出。但方中品味，未能一一商订，皆垂暮精
神不能周浃之故，阅者谅之。
一、论中于精要处用“。”，提纲处用“、”，俾阅者得其意旨，一目了然。
一、方名重复者，则不注药味，但书见某卷某症。至于方名同而药味不同者，则仍载原方。
一、外科另属一门，今附论数篇，列于卷末，俾阅者略知要领。
一、医学典籍浩如烟海，想要找到一部搜集全面、分析详尽的著作，没有比《准绳》这一书更好的了。本编务求简明扼要，使读者阅读时豁然开朗、心情舒畅，因此论述路径各有不同。
二、张仲景的《伤寒论》，应当参考各家学派的辨证论述，本书仅选取《医学心悟》中的几条内容，无法全部记载。
三、春温病和夏热症，多属于伏气伤寒（寒邪潜伏体内，过时而发），邪气从肾脏发出，这正是经典中所说的：“冬天感受寒邪，春天必定发生温病；冬天不能藏精，春天必定发生温病。”这与通过口鼻吸入的邪气，潜伏在募原（半表半里之间）的情况不同，深浅各异，治疗方法也不同，学习者应当分别观察辨析。
四、时疫症（具有流行性的温热疫病），张景岳的治疗失之于过度使用温补法，吴又可又只主张急下法（用峻下药迅速通便泄热）。《张氏医通》阐明了地气郁蒸（湿热之气郁结蒸腾）这一义理，最值得参考研究。
五、香岩叶天士先生所传的《临证指南医案》，医案是根据诊疗过程即时记录的，无暇修饰润色。然而如脾脏和胃腑，历来被混淆治疗，叶先生唯独依据经典旨意，提出“脾喜燥而恶湿，胃喜凉而恶热”的观点，领悟出“脏主守（固摄精气）、腑主通（传导糟粕）”这两层含义。论述李东垣的补中益气汤治疗重点在脾，张仲景的急下存阴法治疗重点在胃，何等高超奇妙！就像不食症（食欲不振或厌食），庸医只知道燥湿健脾，结果越燥越导致便秘结滞，叶先生唯独主张滋养胃阴，遵循其治法往往见效，这类见解都是我所衷心信服并牢记的。
六、肝风眩晕与类中风症状相近，原本可以归为一门，此处根据《指南》的体例，单独列出，意在醒目突出。
七、目疾、喉科、乳科均属于专科范畴，病症和治疗法则繁琐复杂，无法全部辑录，这里仅摘取其主要要点。
八、各种病症以经典理论为依据立论，斟酌古代方剂加以应用，列出纲领细分条目，都是层层推究考证得出的。但方剂中的药物组成，未能一一仔细核对订正，这都是因为作者年老精力不能周全的缘故，请读者谅解。
九、论述中在精要之处使用句号“。”，在提纲挈领之处使用顿号“、”，以便读者领会其意旨，一目了然。
十、方名重复的，则不标注药物组成，只注明见于某卷某症。至于方名相同但药物组成不同的，则仍然保留记载原方。
十一、外科另属一门学科，现在附录几篇论述，列于卷末，使读者略知要领。
1. Medical classics are as vast as the sea and sky; to find a work that is comprehensive in collection and detailed in analysis, none surpasses *Zhunsheng* (Standard of Diagnosis). This compilation strives for conciseness, aiming to make the reader's vision clear and mind refreshed; thus, the approaches taken vary.
2. Regarding Zhang Zhongjing's *Shanghan Lun* (Treatise on Cold Damage), it is advisable to consult the辨证 (pattern differentiation) discussions of various schools. Here, only a few excerpts from *Yixue Xinyu* (Medical Enlightenment) are selected, and it is impossible to record them all.
3. Spring-warmth (Chunwen) and summer-heat syndromes often involve latent-cold cold damage (Fuqi Shanghan, where pathogenic cold lies dormant within the body and manifests later). The pathogen emerges from the Kidney. This corresponds to the classic statement: "If one is injured by cold in winter, one will inevitably suffer from warmth diseases in spring; if one fails to store essence in winter, one will inevitably suffer from warmth diseases in spring." This differs from pathogens inhaled through the mouth and nose, which lie dormant at the Mu Yuan (Moyuan, the space between the exterior and interior); their depth varies, and treatments differ accordingly. Students should observe and distinguish them separately.
4. In the treatment of seasonal epidemic diseases (Shiyi Zheng), Zhang Jingyue erred by overusing warming and tonifying methods, while Wu Keyou focused solely on urgent purgation (Jixia). *Zhangshi Yitong* (Comprehensive Essentials of Zhang) elucidates the concept of earth qi stagnation and steaming (Diqi Yuzheng, where damp-heat qi stagnates and steams), which is most worthy of reference and study.
5. Mr. Ye Tianshi (Ye Xiangyan) transmitted the *Linzheng Zhinan* (Guidelines for Clinical Practice). These case records were established according to diagnoses and consultations, leaving no time for refinement. However, regarding the Spleen and Stomach organs, which have historically been treated indistinguishably, Mr. Ye alone followed the principles of the classics, noting that the Spleen prefers dryness and the Stomach prefers coolness. He realized two key meanings: "Zang organs govern retention (Shou), while Fu organs govern unblocking (Tong)." He discussed how Li Dongyuan's Buzhong Yiqi Tang targets the Spleen, while Zhang Zhongjing's urgent purgation to preserve Yin targets the Stomach—how profound and exquisite! For instance, in cases of anorexia (Bushí), crude practitioners only know to dry the Spleen, leading to greater stagnation with more drying. Mr. Ye alone advocated nourishing Stomach Yin, and following his treatment yielded consistent results. Such insights are what I have long held dear and firmly believed in.
6. Liver wind dizziness is similar to stroke-like syndromes (Lei Zhongfeng) and could originally be grouped into one category. Here, following the example of the *Zhinan*, it is singled out separately to draw attention.
7. Eye disorders, throat diseases, and breast diseases all belong to specialized departments. Their symptoms and treatments are complex and cumbersome, making it impossible to compile them fully. Here, only their essentials are summarized.
8. Discussions on various syndromes are based on classical theories, and ancient formulas are carefully selected for use. Outlines and sub-items are derived through layer-by-layer deduction. However, the specific ingredients in the formulas could not be verified one by one, due to my declining energy in old age. Readers are asked to understand this.
9. In the text, periods "." are used for essential points, and enumeration marks "、" are used for outline points, so that readers can grasp the intent at a glance.
10. For repeated formula names, drug ingredients are not annotated, but rather noted as appearing in a specific volume and syndrome. For formulas with the same name but different ingredients, the original formulas are still recorded.
11. Surgery belongs to a separate discipline. A few essays on surgery are now appended at the end of the volume, so that readers may briefly understand the essentials.