《旧唐书·列传·卷一百二十七》
僖宗对杜让能深表爱重地说： 由于我的违背道义，致使再度招致流离迁徙的祸患。
帝顾谓之曰： 朕之失道，再致播迁。
Emperor Xizong expressed his deep love for Du Rangneng and said: "Because I violated the moral principles, I have once again led to a disaster of fleeing.