《资治通鉴·唐纪·唐纪六十三》
杜向武宗感谢任命时，武宗安慰他说： 你不曲从监军的请求，朕知道你有爱护朕的心意。现在，任命你为宰相，朕如同得到一个魏徵！ 
及悰中谢，上劳之曰： 卿不从监军之言，朕知卿有致君之心，今相卿，如得一魏征矣！ 
When Du thanked Wu Zong for the appointment, Wu Zong comforted him: “You didn't follow the inspector's request. I know that you have the intention to care for me. Now, I have appointed you as prime minister, and I am like getting a Wei Zheng!”