《资治通鉴·唐纪·唐纪六十》
现在，朝廷要想收复河朔三镇，上策是首先整顿内部，中策不如首先出兵攻取魏博，最为下策的是轻率出兵讨伐，既不顾地势是否有利，也不慎重地制定攻守方略。 
今上策莫如先自治，中策莫如取魏，最下策为浪战，不计地势，不审攻守是也。 
Now, if the court wants to recover the three towns of Heshuo, the best strategy is to rectify the internal affairs first, the middle strategy is better than sending troops to capture Weibo first, and the worst strategy is to send troops to punish rashly, regardless of whether the terrain is favorable or not. Make offensive and defensive strategies carefully.