《旧唐书·列传·卷九十八》
在这之前，李吉甫制定策试的直言极谏科目，其中有讥刺时政，忤犯权臣佞幸的内容，因此裴均的同党扬言这都是执掌政柄的人所教唆、指使，妄图以此动摇李吉甫的地位，幸而谏官李约、独孤郁、李正辞、萧亻免秘密上疏陈报，皇上的疑意才消除。
先是，制策试直言极谏科，其中有讥刺时政，忤犯权幸者，因此均党扬言皆执政教指，冀以摇动吉甫，赖谏官李约、独孤郁、李正辞、萧俛密疏陈奏，帝意乃解。
Before that, Li Jifu had formulated a testing subject of speaking candidly and remonstrating, the content of which contained satire of current affairs, and offending the powerful and favored subjects, therefore, Pei Jun's party said that these were all taught and instructed by those holding power, trying to shake Li Jifu's position with this, but thanks to the secret memorials by the remonstrating officials Li Yue, Dugu Yu, Li Zhengci, and Xiao Renmian, the emperor's doubts were dispelled.