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1 客谓顾子曰:「子所著《方舆纪要》一书,集百代之成言,考诸家之绪论,穷年累月,矻矻不休。至于舟车所经,亦必览城郭,按山川,稽里道,问关津,以及商旅之子,征戍之夫,或与从容谈论,考核异同。子于是书,可谓好之勤,思之笃矣。后有起者,考求险要,辨别攻守,远而周知天下之故,近而都邑之间,非子之书,何所适从焉?」余曰:「否否,不然。古人有言,『尺有所短,寸有所长』,明于匠石之任者,或昧于雕镂之细。予也未尝泝江河,登恒岱,南穷岭海,北上燕然。间有涉历,或拘于往返之程,或困于羁旅之次。不获放旷优游,博观广询,间尝按之图画,索之典籍,亦举一而废百耳。又或了了于胸中,而身至其地,反若瞶瞶焉。所谓所见异辞,所闻异辞,所传闻又异辞者,不可胜数也。予之书其足据乎?且孙子有言:『不知山林险阻沮泽之形者,不能行军,不用乡导者,不能得地利。』夫论兵之妙,莫如孙子;而论地利之妙,亦莫如孙子。使信余之书,而不取信于乡导,譬之掩耳而求闻,闭目而求见,所悞必多矣。且夫地利亦何常之有哉?函关、剑阁,天下之险也。秦人用函关,却六国而有馀。迨其末也,拒羣盗而不足。诸葛武侯出剑阁,震秦陇,规三辅。刘禅有剑阁,而成都不能保也。故金城汤池,不得其人以守之,曾不及培塿之丘、泛滥之水;得其人,即枯木朽株,皆可以为敌难。是故九折之阪、羊肠之径,不在邛崃之道、太行之山;无景之溪、千寻之壑,不在岷江之峡、洞庭之津。及肩之墙,有时百仞之城不能过也;渐车之浍,有时天堑之险不能及也。知求地利于崇山深谷、名城大都,而不知地利即在指掌之际,乌足与言地利哉?善乎孙子之言曰:『我不欲战,虽画地而守之,敌不能与我战;我欲战,敌虽高垒深沟,不得不与我战。』然则变化无穷者,地利也。地利之微,图不能载,论不能详,而变化于神明不测之心。所谓可以意会,不可以言传者乎!故曰:方圆奇偶,千秋不易也。伏羲以之画八卦,大禹以之演九畴。伍两卒旅,千秋不易也。武侯以之列八阵,李靖以之变六花。城郭山川,千秋不易也。起于西北者,可以并东南,而起于东南者,又未尝不可以并西北。故曰:不变之体,而为至变之用;一定之形,而为无定之准。阴阳无常位,寒暑无常时,险易无常处。知此义者,而后可与论方舆。使铢铢而度之,寸寸而比之,所失必多矣。吾尝考蒙古之用兵,奇变恍惚,其所出之道,皆师心独往,所向无前。故其武略,比往古为最高。彼岂尝求之于山海之图、里道之志哉?然则求地利于吾书,无乃犹是刻舟之见乎?吾虑举足动步,或将有碍焉者也。客其益广所闻,无过恃吾之书也已。」
URN: ctp:ws904878

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