《资治通鉴·宋纪·宋纪十五》
即使有几个小贼，也翻不起大浪。按照平常的驻防，足以保全自己。而且，敦煌的地理位置非常重要，可隔断西方、北方二敌的接触，使得他们不能往来。
循常置戍，足以自全；而能隔阂西、北二虏，使不得相通。
"Even if there are a few small thieves, they will not cause much trouble. According to the usual garrison, it is enough to protect yourself. Moreover, Dunhuang is located in a very important geographical position, and it can block the contact between the two enemies from the west and north, making it impossible for them to communicate."