《贞观政要·卷三·君臣鉴戒》
像隋炀帝，他为人非常暴虐，臣下不敢进言，这使他不知道自己的过失，最后国破家亡，大臣虞世基等人不久也被杀死。
至如隋炀帝暴虐，臣下钳口，卒令不闻其过，遂至灭亡，虞世基等寻亦诛死。
Take Emperor Yang of Sui for example. He was very violent, and his ministers dared not to offer advice, so he did not know his own mistakes, and ultimately the country fell and his family was destroyed, and soon after, courtiers such as Yu Shiji were killed.