《淮南子·兵略训》
现在那虎豹虽然敏捷，熊罴虽然力大，但人还是能吃它们的肉，用它们的皮做垫席，这是因为它们之间不能互相沟通思想、统一力量。
今夫虎豹便捷，熊罴多力，然而人食其肉而席其革者，不能通其知而壹其力也。
Now, although the tiger and leopard are agile and the bear and the brown bear are powerful, man can still eat their flesh and use their skins as rugs, because they cannot communicate with each other and unite their forces.