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In the eastern part of Wulin City, there once lived a virtuous man named Wang Xiansheng Shaolong. His character was simple and steady; people did not understand him. He wore tattered hats and worn-out shoes, and studied under Master Shaojue. The master knew in his heart that he was a worthy person. Later, he attained the Dao, thereby uncovering the treasures hidden in the Linglan Golden Casket (a metaphor for ancient medical texts), mastering all his techniques, and verifying and explaining them thoroughly. When treating diseases, he was decisive and clear, without any hesitation or doubt. After Mr. Wang passed away, his teachings spread widely. Pan Weng Denglin was his chief disciple, hence the emergence of the Pan school of medicine in the east of the city.

For several years, Master Pan’s medical proficiency has flourished daily, and his reputation has grown heavier, yet he always says: "Alas! This is the teaching of my Master Wang." He wrote tens of thousands of words on pulse diagnosis and syndromes, and many people consumed herbal decoctions under his guidance, but Master Pan always humbly says: "Alas! This is the teaching of my Master Wang." People consider the Pan family virtuous because of this, and those seeking to become his disciples fear being left behind. I observe that the relationship between master and disciple since ancient times is indeed difficult to discuss. Since Ma Rong, the great Confucian scholar, could not help but suspect his disciple Zheng Kangcheng; and Lu Bushu, who perhaps did not know his teacher's writings. Moreover, whether a scholar is wise or foolish, entering the court invites jealousy; whether a woman is beautiful or ugly, entering the palace invites envy. Beautiful things are vessels of ill omen. Would the incident where Li Xi, the Qin imperial physician, killed Gongshu Ban not possibly occur within one's own gate? Yet Master Pan never forgot his teacher throughout his life, and his disciples served him even more diligently. They selected the Pulse Books of Huangdi and Bian Que, as well as works by various famous masters of recent times, analyzing them item by item and line by line, studying tirelessly. Master Pan's way of teaching his disciples is just like how Master Wang taught him; and the disciples' service to Master Pan is exactly like how Master Pan served Master Wang. Can this not be called rare?

Master Pan has been a sincere elder throughout his life; his miraculous medical skills, akin to Changsang Jun and Yang Qing, need not be mentioned further. However, these young men, possessing outstanding talents and being the pride of their local communities, despised classical studies, treated official honors as worn-out shoes, yet their hearts yearned deeply, just as the seventy disciples of Confucius served Confucius. Is this not due to Master Pan's extraordinary morality attracting such results? I am particularly moved by this. For a scholar to preserve life and nature in this world is extremely difficult. Qiao Xuan could not avoid disaster despite his numerology skills; Li Ye could not avoid it despite his integrity; Zuo Ci could not avoid it despite his magical arts; Huo Yuan could not avoid it despite his teaching abilities. Master Pan and his disciples studied their medical formulas, causing no harm to things and having no conflict with people. They can be considered noble gentlemen, possessing substance and elegance. This is what I sigh about as unattainable.

In the year of Zhixu (Guiwei), when Master Pan turned sixty, the book *Yideng* (Medical Lamp) was completed. I was delighted to obtain and read it. It encompasses all existence and analyzes minute details to perfection; yet it dares not claim to form a unique school, comparing itself to annotations. Master Pan's richness in learning, precision in skill, and humility in ambition—how could shallow scholars with limited techniques fathom its profound depths? Recently, Jiang Jiemei entrusted me with some words, so I narrated the lineage of their master-disciple relationship as a birthday gift for Master Pan, and thus as the preface to this book. Therefore, the means by which Master Pan benefits the world lie herein.

Chen Chaofu Xiewu from Siming respectfully wrote the preface at the Buxizhou (Unmoored Boat) in Xiling.