《汉书·传·爰盎晁错传》
而且我担心天下的士大夫闭口，不敢进言了厂皇上说： 为什么呢? 
且臣怒天下之士箝口不敢复言矣。 上曰： 何哉？ 
Furthermore, I am worried that the scholars and officials throughout the realm will keep their mouths shut and not dare to speak out. The emperor said: Why is that?