《资治通鉴·唐纪·唐纪三十四》
肃宗说： 广平王李是嫡长子，将来要继承皇位，何必把元帅之职看得那么重呢！ 
上曰： 广平，冢嗣也，何必以元帅为重！ 
Emperor Suzong said: "King Guangping Li is the eldest son and heir to the throne. Why should he value the position of commander-in-chief so highly?"