关键词:焦循;易学;象数;义理;声训
A particular I Ching learning structure established by JIAO Xun of the Qing Dynasty
Abstract: This paper made a textual research on JIAO Xun's theories of Pangtong (a relationship between two completely opposite hexagrams), Xiangcuo (a relationship between a hexagram and its inversion), and Shixing (conducting with time). Basing on this, the author points out: at first, it is more significant for JIAO Xun's regarding the 64 hexagrams of Zhouyi as a interrelated, everchanging, dynamic system departing from views of universality of inter reaction and transformations between lines of a hexagram, than studying a hexagram or a line in isolation. Secondly, the establishment of JIAO Xun's particular I Ching learning structure is based on textual research with objective analysis. So, it is not advisable to negate it arbitrarily. Thirdly, JIAO Xun's I Ching learning does not base merely on images and numbers, but take advantage of them as a carrier to elaborate his political ideal with Confucian virtues and self cultivation. At last, it is worthy of discussing on whether it is the original meaning or not to acoustically explain interrelations between 2 or more hexagrams by JIAO Xun, yet, it is regretful that his acoustic explanation lacks of adequate documentary prop.
Key words: JIAO Xun; I Ching learning; image-number; philosophical connotations; acoustic explanations
焦循是清代著名的经学家,“于学无所不通,于经无所不治”[1](卷六),尤以对《周易》用力最勤,成就也最为卓著。焦循提出的独特的易学构架问世以后,在易学界产生了巨大的冲击波。褒扬者称其“石破天惊”“凿破混沌”(王引之、阮元、梁启超等持此说。),贬斥者则讥其“附会难通”“支离破碎”,乃至于全盘否定。(尚秉和、李镜池、高亨等持此说。)笔者仔细研读了焦循的易学论著。在对其易著的研读过程中,笔者逐渐形成了一些认识。现将这些认识提出,以就正于方家。
一
焦循在《易图略·叙目》中说:“余学《易》所悟得者有三:一曰旁通,二曰相错,三曰时行。此三者皆孔子之言也,孔子所以赞伏羲、文王、周公者也。夫《易》犹天也,天不可知,以实测而知。七政恒星错综不齐,而不出乎三百六十度之经纬;山泽水火错综不齐,而不出乎三百八十四爻之变化。本行度而实测之,天以渐而明;本经文而实测之,《易》以渐而明。非可以虚理尽,非可以外心衡也。余初不知其何为相错,实测经文传文而后知比例之义出于相错,不知相错则比例之义不明;余初不知其何为旁通,实测经文传文而后知升降之妙出于旁通,不知旁通则升降之妙不著;余初不知其何为时行,实测经文传文而后知变化之道出于时行,不知时行则变化之道不神。未实测于全《易》之先,胸中本无此三者之名,既实测于全《易》,觉经文有如是者乃孔子所谓相错,有如是者乃孔子所谓旁通,有如是者乃孔子所谓时行。实测既久,益觉非相错、非旁通、非时行则不可以解经文、传文,则不可以通伏羲、文王、周公、孔子之意。十数年来,以测天之法测《易》,而此三者乃从全《易》中自然契合。……夫祖冲之立岁差,傅仁均立定朔,当时泥古者惊为异说。余以此三事说《易》,亦祖氏之岁差,傅氏之定朔也。知我者益加密焉,余之所深冀也。”[2](卷首)
由上段引文,我们可以看出:1以旁通、相错、时行三说通释《周易》,是焦循所构建的独特的易学框架;2此构架不是出于焦循的主观臆测,而是通过十余年对《周易》的“实测”、归纳所得;3焦循对此构架非常自信,认为只有此构架才可以“通伏羲、文王、周公、孔子之意”,并将此构架比之于“祖氏之岁差,傅氏之定朔”,希望后人“益加密焉”。以下我们就具体考述焦循的旁通、相错、时行三说。
(一) 旁通
关于“旁通”,阮元在《通儒扬州焦君传》中说:“旁通者,在本卦,初与四易,二与五易,三与上易,本卦无可易,则旁通于他卦,亦初通于四,二通于五,三通于上。”[3](卷首)焦循在《易图略》中说:“凡爻之已定者不动,其未定者,在本卦,初与四易,二与五易,三与上易,本卦无可易,则旁通于他卦,亦初通于四,二通于五,三通于上。……初必之四,二必之五,三必之上,各有偶也。初不之四,二不之五,三不之上,而别有所之,则交非其偶也。”[2](卷一)
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