《汉书·传·匡张孔马传》
张禹虽然已经辞官，但仍以特进之官做皇帝的老师，每当国家有重大决策，皇上一定要询问张禹。
禹虽家居，以特进为天子师，国家每有大政，必与定议。
Although Zhang Yu had already resigned from his official position, he was still the emperor's teacher through the special office of Tejin. Whenever there were major decisions in the country, the emperor had to consult Zhang Yu.