《新唐书·列传·卷十六》
彦博性情周密谨慎，既已掌管国家机务，便谢绝宾客不与往来，进见皇上必定陈说政事利害。
彦博性周慎，既掌机务，谢宾客不通，进见必陈政事利害。
Yanbo was meticulous and cautious by nature; after assuming the duties of state, he declined to meet guests or socialize, and would only discuss matters of state importance when he had an audience with the Emperor.