《资治通鉴·唐纪·唐纪三十五》
现在我们如果命令李光弼率兵从太原出井陉关，郭子仪率兵从冯翊进入河东，这样史思明与张忠志便不敢离开范阳与常山，安守忠与田乾真则不敢离开长安，我们以两支军队拖住了叛军的四员骁将，跟随安禄山的只有阿史那承庆了。
今若令李光弼自太原出井陉，郭子仪自冯翊入河东，则思明、忠志不敢离范阳、常山，守忠、乾真不敢离长安，是以两军絷其四将也，从禄山者，独承庆耳。
Now if we order Li Guangbi to lead troops from Taiyuan to Jixing Pass, and Guo Ziyi to lead troops from Fengyi to Hedong, Shi Siming and Zhang Zhongzhi will not dare to leave Fanyang and Changshan, and An Shouzhong and Tian Qianzhen will not dare to leave Chang'an. We will have two armies to contain the four brave generals of the rebels, with only Ashina Chengqing following An Lushan.