《新唐书·列传·卷五十》
臣认为岐州、陇州多年穷困荒凉，假若千乘万骑的人马前往，军饷供应庞大势必增加徭役，加上外寇的掠夺，人民将不堪重负，此其一。
臣谓岐、陇凋弊积年，若千乘万骑，供亿不涯，诚恐徭役内兴，寇掠外虞，斯人不堪，一也。
I believe that Qizhou and Longzhou have been impoverished and desolate for many years. If thousands of cavalrymen go there, the military supply will be huge and the corvee will inevitably increase. Combined with the plundering of foreign invaders, the people will be overwhelmed. This is one reason.