《旧唐书·列传·卷八十三》
李晟常说： 河州、陇州地区的丢失，并非是吐蕃用军队夺取的，都因我们将领贪婪残暴，部族不安，人民不能安心耕种，陆续东迁，自己丢弃了那里。
晟常曰； 河、陇之陷也，岂吐蕃力取之，皆因将帅贪暴，种落携贰，人不得耕稼，展转东徙，自弃之耳。
Li Sheng often said: The loss of Hezhou and Longzhou was not caused by Tubo seizing them with an army, but because our generals were greedy and cruel, the tribes were uneasy, and the people couldn't live in peace and plant their crops, so they gradually moved eastward and abandoned the area.