《汉书·传·匡张孔马传》
匡衡在任太子少傅的几年中，多次上疏陈述皇上应该做的事情，遇到朝廷有政事需要议论，匡衡总是依据经义来回答，言谈多符合法则义理。
衡为少傅数年，数上疏陈便宜，及朝廷有政议，傅经以对，言多法义。
During the years of his position as Junior Tutor to the Crown Prince, Kuang Heng repeatedly presented memorials, stating what the Emperor should do. When the imperial court had political affairs that needed discussion, Kuang Heng always relied on the classics to answer, and his speech often conformed to lawful reason and principles.