《资治通鉴·后汉纪·后汉纪二》
十一月丙辰，内殿直韩训进献攻城的器械，高祖说： 守城所倚仗的，是众人的心；如果众人离心离德，城池就无人保卫，用这些器械干什么！ 
十一月，丙辰，内殿直韩训献攻城之具，帝曰： 城之所恃者，众心耳。众心苟离，城无所保，用此何为！ 
On the Bingchen day in November, Han Xun, the Straight of the Inner Palace, offered weapons to attack the city. Gao Zu said: What the city defenders rely on is the heart of the people; if the people are alienated, there will be no one to defend the city. What's the use of these weapons!