신라 승려의 『금광명경』「제병품」 주석을 통해 살펴본 한국 고대 불교의학*

Nearly nothing is known of medicine in ancient Korea due to insufficient materials. With several extant prescriptions and esoteric methods of treating diseases alone, it is impossible to gauge in depth the management of medicine during this period. If one exception were to be cited, that would be the fact that the annotations for understanding the contents on Indian medicine in the “Chapter on Eliminating Disease” in the Sutra of Golden Light, a Buddhist sutra originating from India, reflected the medical knowledge of Buddhist monks from Silla (新羅, 57 BC-935 AD) who were active immediately after the nation’s unification of the two other kingdoms on the Korean Peninsula (668 AD) such as Wonhyo (元曉, 617-686 AD), Gyeongheung (憬興, 620?-700? AD), and Seungjang (勝莊, 684-? AD). Along with those by other monks, these annotations are collected in the Mysterious Pivot of the Sutra of Golden Light (金光明經最勝王經玄樞), which was compiled by Gangyō(願曉, 835-871 AD), a Japanese monk from the Heian era (平安, 794-1185 AD). Representative versions of the “Chapter on Eliminating Disease” in the Sutra of Golden Light include: a classical Chinese translation by the Indian monk Dharmakṣema (曇無讖, 385-433 AD); the eight-volume edition by Chinese monk Baogui (寶貴), which differs little from the preceding work in terms of the contents of the “Chapter on Eliminating Disease”; and the ten-volume edition by Yijing (義淨, 635-713 AD), who had full-fledged knowledge of Indian medicine. When the contents of the annotations thus collected are examined, it seems that Wonhyo had not been aware of the existence of the ten-volume edition, and Gyeongheung and Seungjang most certainly used the ten-volume edition in their annotations as well. Especially noteworthy are Wonhyo’s annotations on the Indian medical knowledge found in the “Chapter on Eliminating Disease” in the Sutra of Golden Light. Here, he made a bold attempt to link and understand consistently even discussions on Indian and Buddhist medicine on the basis of the traditional East Asian medical theory centering on the yin-yang (陰陽) and five phases (五行, wuxing). In accordance with East Asia’s theory of the seasonal five phases, Wonhyo sought to explain aspects of Indian medicine, e.g., changes in the four great elements (四大, catvāri mahā-bhūtāni) of earth, water, fire, and wind according to seasonal factors and their effect on the internal organs; patterns of diseases such as wind (vāta)-induced disease, bile (pitta)-induced disease, phlegm (śleṣman)-induced disease, and a combination (saṃnipāta) of these three types of diseases; pathogenesis due to the indigestion of food, as pathological mechanisms centering on the theory of the mutual overcoming (相克, xiangke) of the five phases including the five viscera (五藏, wuzang), five flavors (五味, wuwei), and five colors (五色, wuse). They existed in the text contents on Indian medicine, which could not be explicated well with the existing medical knowledge based on the theory of the five phases. Consequently, he boldly modified the theory of the five phases in his own way for such passages, thus attempting a reconciliation, or harmonization of disputes (和諍, hwajaeng), of the two medical systems. Such an attempt was even bolder than those by earlier annotators, and Wonhyo’s annotations came to be accepted by later annotators as one persuasive explanation as well. In the case of Gyeongheung and Seungjang, who obtained and examined the ten-volume edition, a new classical Chinese translation produced following Wonhyo’s death, annotated the “Chapter on Eliminating Disease” based on their outstanding proficiency in Sanskrit and knowledge of new Indian and Buddhist medicine. This fact signifies that knowledge of the eight arts (八術) of Ayurvedic medicine in India was introduced into Silla around the early 8th century. The medical knowledge of Wonhyo, Gyeongheung, and Seungjang demonstrates that intellectual circles in contemporary Silla were arenas in which not only traditional East Asian medicine as represented by works such as the Inner Canon of the Yellow Emperor (黃帝內經, Huangdi Neijing) but also Indian medicine of Buddhism coexisted in almost real time.