《贞观政要·卷二·论求谏》
至于像隋炀帝残暴淫虐，臣下都把嘴闭起来不讲话，最后终于因为听不到自己的过失而导致灭亡，虞世基等人不久也被诛杀。
至于隋炀帝暴虐，臣下钳口，卒令不闻其过，遂至灭亡，虞世基等，寻亦诛死。
Take, for example, Emperor Yang of Sui who was cruel and tyrannical. His subjects kept silent and never spoke out. Consequently, he could not hear about his own faults and met his ruin. Yu Shiji and others were also soon executed.