深虑论

古文观止 · section 178 · 吳楚材 · 吳調侯 編 · 682 characters

Original text

虑天下者,常图其所难,而忽其所易;备其所可畏,而遗其所不疑。然而祸常发于所忽之中,而乱常起于不足疑之事。岂其虑之未周与?盖虑之所能及者,人事之宜然,而出于智力之所不及者,天道也。

当秦之世,而灭诸侯,一天下,而其心以为周之亡在乎诸侯之彊耳,变封建而为郡县。方以为兵革可不复用,天子之位可以世守,而不知汉帝起陇亩之中,而卒亡秦之社稷。汉惩秦之孤立,于是大建庶孽而为诸侯,以为同姓之亲可以相继而无变,而七国萌篡弑之谋。武、宣以后,稍剖析之而分其势,以为无事矣,而王莽卒移汉祚。光武之惩哀、平,魏之惩汉,晋之惩魏,各惩其所由亡而为之备,而其亡也,皆出于所备之外。唐太宗闻武氏之杀其子孙,求人于疑似之际而除之,{{*|,有传秘记云:「唐三世之后,女主武氏,代有天下。」上密问太史令李淳风:「秘记所云,信有之乎?」对曰:「臣仰观天象,俯察历数,其人已在陛下宫中。自今不过三十年,当王天下,杀唐子孙殆尽,其兆既成矣。」上曰:「疑似者尽杀之,何如?」○人事。}}而武氏日侍其左右而不悟。宋太祖见五代方镇之足以制其君,尽释其兵权,使力弱而易制,而不知子孙卒困于敌国。此其人皆有出人之智、盖世之才,其于治乱存亡之几,思之详而备之审矣。虑切于此而祸兴于彼,终至乱亡者何哉?盖智可以谋人,而不可以谋天。良医之子多死于病,良巫之子多死于鬼。岂工于活人而拙于活己之子哉?乃工于谋人而拙于谋天也。

古之圣人,知天下后世之变非智虑之所能周,非法术之所能制,不敢肆其私谋诡计,而唯积至诚、用大德以结乎天心,使天眷其德,若慈母之保赤子而不忍释。故其子孙虽有至愚不肖者足以亡国,而天卒不忍遽亡之,此虑之远者也。夫苟不能自结于天,而欲以区区之智笼络当世之务,而必后世之无危亡,此理之所必无者,而岂天道哉!

天道为智力之所不及,然尽人事以合天心,即天亦有可谋处。此文归到积至诚、用大德,正是祈天永命工夫。古今之论天道人事者多,得此乃见透快。

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深慮論 — 古文觀止