《资治通鉴·唐纪·唐纪十八》
吐蕃派遣大臣仲琮入朝进贡，唐高宗向他询问吐蕃地方的风俗，他回答说： 吐蕃土地贫瘠，天气寒冷，民风诚朴迟钝，但法令严肃而完备，上下一心，讨论政事常常自下而上，根据人们的利益所在而实施。这是吐蕃能够长期存在的原因。 
吐蕃遣其大臣仲琮入贡，上问以吐蕃风俗，对曰： 吐蕃地薄气寒，风俗朴鲁；然法令严整，上下一心，议事常自下而起，因人所利而行之，斯所以能持久也。 
Tufan sent a senior minister, Zhong Zong, to the court to pay tribute. Tang Gaozong asked him about the customs of Tufan. He replied: The land of Tufan is poor and infertile; the weather is cold, and the people are simple and naive. However, the laws are strict and rigorous, and the people above and below are united. When discussing politics, they often start from the bottom and progress upwards, implementing policies based on the interests of the people. This is the reason why Tufan has been able to exist for such a long time.