论俞琰理不外象、援易入丹的易学诠释取向

On Yu Yan's Imagery-oriented Thought on the Changes and His Transplanting of Principles of Changes to Alchemical Daoism

俞琰的易学思想包括对易学理论本身的探讨和援易入丹两个方面。在易学理论本身的探讨方面,他本着"辞必本于画,理不外于象"的原则,以经传文本为根据,择取自汉至宋的象学体例,对卦爻取象进行了阐发,并探讨了天地之数和大衍之数,提出太极之数是大衍之数形成的先天理据;在援易入丹方面,他以易学服务于内丹修炼学,引入太极之道,为内丹修炼学找到了先天的根据,借助易象、易数、易图阐发了内丹学理论,揭示了道教内丹学与易学在义理上的相通无碍。他的易学思想不仅有功于易学,还推动了道教内丹学理论的发展,对后世道教易学的发展做出了一定的贡献。

Yu Yan＇s thought on the Changes includes two aspects of discussions on the theory of Yi learning itself and transplantingprinciples of Changes to Alchemical Daoism. In the former aspect, basing himself on the idea “the hexagram and line statements musthave been derived from the hexagram pictures and principles cannot go beyond images” and selecting reasonable image-oriented theo-ries from the Han （206 BCE-220 CE） to the Song （960-1279） dynasties, he elaborated on the images used in the basic text of andthe “Commentaries” on the Changes and discussed the number of Heaven and Earth as well as that of the Great Expansion, in thecourse of which he raised his idea that the number of Taiji [lit., Supreme Ultimate] is the inherent basis for the formation of the num-ber of the Great Expansion. For the latter aspect is concerned, he took Yi learning to serve internal alchemy refinery by adopting theDao （Way） of Taiji[Supreme Ultimate] and thus discovered a pre-heaven theoretic basis for internal alchemy refinery. In addition, hedrew upon the images, numbers, and diagrams of the Changes so as to explicate internal alchemy refinery and reveal compatibility be-tween Yi learning and Alchemical Daoism. His thought on the Changes not only contributed to Changes studies but also enriched theo-ries of Alchemical Daoism.