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The character "Yi" (Medicine) implies "Yi" (Intention/Meaning). The divine aspect resides in the realm of mindful contemplation; it can be comprehended by the mind but is difficult to articulate with words. Does this mean that written prescriptions are useless? Not at all. Observing the *Lingshu* (Spiritual Pivot) and *Suwen* (Basic Questions), which originated from the Yellow Emperor, subsequent generations of physicians authored books and established theories. There were many such individuals, each school inheriting from the previous, with successive lineages of teachers and students. By investigating ancient knowledge and carefully examining patients, they corrected deviations and failures, saving those who would otherwise die prematurely. Their merit is indeed great! Therefore, not relying on medical texts is a state of profound self-realization achieved by highly skilled physicians, and one cannot generalize this standard to all physicians in the world. Thus, medicine is the art of saving people, while the compilation of medical texts serves to transmit what has been understood in the heart to future generations, thereby benefiting humanity indefinitely. However, this book relies on personal opinion; there is a fear that subjective bias may lead to prejudice, and rigid adherence to established rules may result in inflexibility, like gluing a tuning peg without knowing how to adapt. A single erroneous statement can cause significant harm, hence the sigh regarding the difficulty of writing medical texts. Nevertheless, compiling medical texts is difficult, and compiling them specifically for pediatrics is even more so. Why? Infants in swaddling clothes cry and laugh without apparent cause, and their pain or itching cannot be expressed by themselves. Their internal organs are not yet fully developed, so they cannot tolerate large doses of medication. Their bones and sinews are still fragile, making acupuncture and moxibustion difficult to apply. Misuse of herbs (Dao Gui refers to measuring spoons for herbs) can damage vital life force. Master Chen Feixia, having gained extensive experience through repeated trials ("three broken arms" metaphor for deep expertise), created the work *Youyou Jicheng* (Complete Collection for Young Children). In his youth, he admired the Daoist pursuit of transcendence and studied the Dao at Mount Luofu, gaining profound insights into the functions of Dragon and Tiger (internal alchemy terms) and the principles of nature and life. He then wandered freely, using medicine to benefit the world. He believed that contemporary pediatricians, following the precedent set by predecessors who labeled certain symptoms of *Shanghan* (Cold Damage) as "Jingfeng" (Convulsion/Wind), had perpetuated errors. Regardless of whether the cause was external contraction or internal injury, any fever was indiscriminately diagnosed as "Jingfeng," leading to widespread misuse of treatments and harm to children, which deeply grieved him. Consequently, he reviewed various earlier pediatric texts, cross-referenced and verified them, combined this with his own clinical experiences, judged their validity, analyzed similarities and differences, replaced the character "Jing" (Convulsion) with "Chu" (Twitch/Spasm), and generally termed conditions as "Chu." He reclassified acute convulsion, chronic convulsion, and slow spleen deficiency into mistaken convulsion, similar convulsion, and non-convulsion, categorizing them meticulously. He detailed precise diagnostic keys and appended empirical formulas. From prenatal care and nursing to diseases such as smallpox, measles, and sores, all conditions were clearly distinguished and systematically organized. Before the book was to be printed, he requested me to write a preface. Upon reading it, I marveled at his benevolent heart and his tireless dedication. Master Chen often achieved miraculous cures. When other physicians deemed a critical patient hopeless, Chen would declare recovery possible; after taking his prescription, patients invariably survived. He treated impoverished patients without accepting payment and sometimes provided expensive tonics like Ginseng and Atractylodes to those in urgent need. If his views did not align with others, he would refuse invitations even from the wealthy and noble. His nature was naturally unrestrained, refusing to conform to worldly trends, thus finding solace in the transcendent realm and harboring thoughts of yielding priority in emergencies. This book, rooted in the subtle Dao of longevity, serves as a spiritual elixir for protecting infants. It can be said to illuminate the Six Perfections and dispel the Four Demons, benefiting both oneself and others. It embodies treating Heaven and Earth as parents and deities as ancestors, pitying the suffering of the young, and promoting nurturing compassion among our fellow humans. May future pediatricians who study and gain from this book clear away centuries of neglect, enabling them to treat infants with precision, adapt cleverly to circumstances, and bring boundless benefits. Having esteemed Master Chen's noble conduct and strong resolve, and believing in the book's potential to circulate widely and endure, I find its spirit resonates with the Confucian ideal of caring for the young and the Emperor's benevolence toward children. Thus, I have cleansed my brush and written this preface.
Liang Yu, Jinshi of the Ministry of Rites, Wenlin Lang, Candidate County Magistrate, from Longquan