第47章 新儒家:理学(1)(2/2)

&esp;&esp;另一个地方有这样一段:“问:有是理便有是气,似不可分先后。曰:要之也先有理。只不可说今日有是理,明日却有是气。也需有先后。”(《朱子语类》卷一)从这几段话可以看出,朱熹心中要说的,就是“天下未有无理之气,亦未有无气之理”,没有无气的时候。由于理是永恒的,所以把理说成是有始的,就是谬误的。因此,若问先有理还是先有气,这个问题实际上没有意义。然而,说气有始,不过是事实的谬误;说理有始,则是逻辑的谬误。在这个意义上,说理与气之间有先有后,并不是不正确的。

&esp;&esp;我们知道,在柏拉图哲学中,要解释可思世界与可感世界的关系,解释“一”与“多”的关系,就发生困难。朱熹也有这个困难,他用“月印万川”的譬喻来解决,这个譬喻是佛家常用的。至于事物的某个种类之理,与这个种类内各个事物关系如何;这种关系是否也可能涉及理的分裂;这个问题当时没有提出来。假使提出来了,我想朱熹还是会用“月印万川”的譬喻来解决。

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&esp;&esp;关于理相对地先于气的问题,是朱熹和他的弟子们讨论得很多的问题。有一次他说:“未有这事,先有这理。如未有君臣,已先有君臣之理;未有父子,已先有父子之理。”(《朱子语类》卷九十五)一个理,先于它的实例,朱熹这段话已经说得十分清楚了。但是一般的理,是不是也先于一般的气呢?朱熹说:“理未尝离乎气。然理形而上者,气形而下者。自形而上下言,岂无先后?”(《朱子语类》卷一)

&esp;&esp;阴阳相交而生五行,由五行产生我们所知道的物质宇宙。朱熹在他的宇宙发生论学说中,极为赞同周敦颐、邵雍的学说。

&esp;&esp;可是,朱熹系统中还有一点,使他的太极比柏拉图的“善”的理念,比亚里士多德的“上帝”,更为神秘。这一点就是,照朱熹的说法,太极不仅是宇宙全体的理的概括,而且同时内在于万物的每个种类的每个个体之中。每个特殊事物之中,都有事物的特殊种类之理;但是同时整个太极也在每个特殊事物之中。朱熹说:“在天地言,则天地中有太极;在万物言,则万物中各有太极。”(《朱子语类》卷一)

&esp;&esp;但是,如果万物各有一太极,那不是太极分裂了吗?朱熹说:“本只是一太极,而万物各有禀受,又自各全具一太极尔。如月在天,只一而已。及散在江湖,则随处而见,不可谓月已分也。”(《朱子语类》卷九十四)

&esp;&esp;另一个问题是:理与气之中,哪一个是柏拉图与亚里士多德所说的“第一推动者”?理不可能是第一推动者,因为“理却无情意,无计度,无造作”。但是理虽不动,在它的“净洁空阔的世界”中,却有动之理,静之理。动之理并不动,静之理并不静,但是气一“禀受”了动之理,它便动;气一“禀受”了静之理,它便静。气之动者谓之阳,气之静者谓之阴。这样,照朱熹的说法,中国的宇宙发生论所讲的宇宙的两种根本成分,就产生出来了。他说:“阳动阴静。非太极动静,只是理有动静。理不可见,因阴阳而后知。理搭在阴阳上,如人跨马相似。”(《朱子语类》卷九十四)这样,太极就像亚里士多德哲学中的上帝,是不动的,却同时是一切的推动者。

)至于宇宙的全体,一定也有一个终极的标准,它是最高的,包括一切的。它包括万物之理的总和,又是万物之理的最高概括。因此它叫做“太极”。如朱熹所说:“事事物物,皆有个极,是道理极致。……总天地万物之理,便是太极。”(《朱子语类》卷九十四)他又说:“无极,只是极致,更无去处了,至高至妙,至精至神,是没去处。濂溪(周敦颐。——引者注)恐人道太极有形,故曰无极而太极。是无之中有个至极之理。”由此可见,太极在朱熹系统中的地位,相当于柏拉图系统中“善”的理念、亚里士多德系统中的“上帝”。

&esp;&esp;气

&esp;&esp;如果只是有“理”,那就只能有“形而上”的世界。要造成我们这个具体的物质世界,必须有“气”,并在气上面加上“理”的模式才有可能。朱熹说:“天地之间,有理有气。理也者,形而上之道也,生物之本也;气也者,形而下之器也,生物之具也。是以人、物之生,必禀此理,然后有性;必禀此气,然后有形。”(《答黄道夫书》,见《朱文公文集》卷五十八)他又说:“疑此气是依傍这理行。及此气之聚,则理亦在焉。盖气则能凝结造作;理却无情意,无计度,无造作。……若理则只是个净洁空阔的世界,无形迹,他却不会造作。气则能酝酿凝聚生物也。但有此气,则理便在其中。”(《朱子语类》卷一)我们在这里可以看出,朱熹是说出了张载可能要说而没有说的话。任何个体事物都是气之凝聚,但是它不仅是一个个体事物,它同时还是某类事物的一个个体事物。既然如此,它就不只是气之凝聚,而且是依照整个此类事物之理而进行的凝聚。为什么只要有气的凝聚,理也必然便在其中,就是这个缘故。

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