《资治通鉴·隋纪·隋纪四》
王劝说杨谅： 大王属下的将领官吏，家属都在关西，要是用这些人，就应该长驱直入，直捣京都，也就是所谓的迅雷不及掩耳；要是只打算割据过去北齐的地盘，就应该任用关东人。 
王頍说谅曰： 王所部将吏，家属尽在关西，若用此等，则宜长驱深入，直据京都，所谓疾雷不及掩耳；若但欲割据旧齐之地，宜任东人。 
Wang persuaded Yang Liang: "Your majesty's generals and officials, their families are all in Guanzhong. If you want to use these people, you should go straight to Kyoto, which is the so-called swift and decisive; If you only plan to divide the land of the Northern Qi Dynasty in the past, you should employ people from Guandong.