nbsp；化&nbsp；的&nbsp；那&nbsp；一&nbsp；關&nbsp；節&nbsp；點&nbsp；（&nbsp；極&nbsp；）&nbsp；誰&nbsp；能&nbsp；掌&nbsp；握&nbsp；呢&nbsp；？&nbsp；難&nbsp；道&nbsp；沒&nbsp；有&nbsp；個&nbsp；正&nbsp；常&nbsp；的&nbsp；情&nbsp；況&nbsp；嗎&nbsp；？&nbsp；正&nbsp；常&nbsp；的&nbsp；又&nbsp；會&nbsp；變&nbsp；面&nbsp；成&nbsp；不&nbsp；正&nbsp；常&nbsp；，&nbsp；好&nbsp；的&nbsp；會&nbsp；變&nbsp；成&nbsp；不&nbsp；好&nbsp；的&nbsp；。&nbsp；（&nbsp；孰&nbsp；知&nbsp；其&nbsp；極&nbsp；？&nbsp；其&nbsp；無&nbsp；正&nbsp；？&nbsp；正&nbsp；復&nbsp；為&nbsp；奇&nbsp；，&nbsp；善&nbsp；復&nbsp；為&nbsp；妖&nbsp；。&nbsp；）&nbsp；這&nbsp；些&nbsp；深&nbsp；刻&nbsp；的&nbsp；思&nbsp；想&nbsp；，&nbsp；不&nbsp；僅&nbsp；被&nbsp；道&nbsp；門&nbsp；所&nbsp；繼&nbsp；承&nbsp；發&nbsp；展&nbsp；，&nbsp；而&nbsp；且&nbsp；對&nbsp；整&nbsp；中&nbsp；國&nbsp；哲&nbsp；學&nbsp；產&nbsp；生&nbsp；了&nbsp；深&nbsp；遠&nbsp；的&nbsp；影&nbsp；響&nbsp；。&nbsp；道&nbsp；家&nbsp；的&nbsp；後&nbsp；學&nbsp；在&nbsp；老&nbsp；子&nbsp；思&nbsp；想&nbsp；的&nbsp；基&nbsp；礎&nbsp；上&nbsp；，&nbsp；又&nbsp；概&nbsp；括&nbsp；出&nbsp；「&nbsp；極&nbsp；而&nbsp；反&nbsp；，&nbsp；天&nbsp；之&nbsp；道&nbsp；也&nbsp；」&nbsp；一&nbsp；類&nbsp；命&nbsp；題&nbsp；，&nbsp；成&nbsp；為&nbsp；中&nbsp；國&nbsp；人&nbsp；觀&nbsp；察&nbsp；事&nbsp；物&nbsp；的&nbsp；至&nbsp；理&nbsp；名&nbsp；言&nbsp；。&nbsp；與&nbsp；此&nbsp；相&nbsp；聯&nbsp；系&nbsp；，&nbsp；道&nbsp；家&nbsp；又&nbsp；認&nbsp；為&nbsp；，&nbsp；柔&nbsp；弱&nbsp；可&nbsp；以&nbsp；勝&nbsp；剛&nbsp；強&nbsp；。&nbsp；老&nbsp；子&nbsp；說&nbsp；∶&nbsp；柔&nbsp；弱&nbsp；，&nbsp；是&nbsp；道&nbsp；的&nbsp；功&nbsp；用&nbsp；。&nbsp；（&nbsp；柔&nbsp；者&nbsp；，&nbsp；道&nbsp；之&nbsp；用&nbsp；。&nbsp；）&nbsp；他&nbsp；比&nbsp；喻&nbsp；說&nbsp；，&nbsp；天&nbsp；下&nbsp；最&nbsp；柔&nbsp；弱&nbsp；的&nbsp；莫&nbsp；過&nbsp；於&nbsp；水&nbsp；，&nbsp；但&nbsp；水&nbsp；攻&nbsp；擊&nbsp；堅&nbsp；強&nbsp；的&nbsp；東&nbsp；西&nbsp；，&nbsp；沒&nbsp；有&nbsp；東&nbsp；西&nbsp；能&nbsp；勝&nbsp；得&nbsp；過&nbsp；它&nbsp；。&nbsp；所&nbsp；以&nbsp；說&nbsp；天&nbsp；下&nbsp；最&nbsp；柔&nbsp；弱&nbsp；的&nbsp；，&nbsp；可&nbsp；以&nbsp；在&nbsp；最&nbsp；堅&nbsp；硬&nbsp；的&nbsp；東&nbsp；西&nbsp；中&nbsp；自&nbsp；由&nbsp；來&nbsp；往&n