《管子·幼官》
指明必胜的道理，慈软的人也会变得勇猛；握有无法防御的武器，愚蠢的人也会变得精明；攻打没有守备的敌军，笨拙的人也会变得巧妙。
明必胜，则慈者勇。器无方，则愚者智。攻不守，则拙者巧。
When shown the reason for certain victory, gentle people will become valiant; when holding the kind of weapon that is impossible to defend against, stupid people will become clever; when attacking an enemy with no defenses, clumsy people will become ingenious.