《管子·枢言》
先王举事，占有一个不利条件两个有利条件的，可成霸业；完全是有利条件的，可成王业；占有一个有利条件两个不利条件的，必然削弱；完全是不利条件的，必然败亡。
先王用一阴二阳者霸，尽以阳者王，以一阳二阴者削，尽以阴者亡。
Whatever the former kings undertook, if they had one disadvantage and two advantages, they could achieve hegemony; if they had all advantages, they could achieve a royal career; if they had one advantage and two disadvantages, they would certainly become weak; if they had all disadvantages, they would certainly perish.