《鬼谷子·鬼谷子·内楗》
就好像母蜘蛛率领小蜘蛛一样，出来时不留洞痕，进去时不留标记，独自前往，独自返回，谁也没法阻止它。所谓 内 就是进献说辞让君主接纳；所谓 揵 就是进献计策。
楗者，楗所谋也。欲说者务隐度，计事者务循顺。
Just like a mother spider leading her young spiders, she leaves no trace of a hole when she comes out, and leaves no mark when she goes in, going alone, returning alone, and no one can stop her. The so-called "inner" is presenting words to the monarch to accept; the so-called "enclosure" is presenting a plan.