《文心雕龙·诠赋》
昔日召公说： 公卿官吏献诗，主管教化的人进箴，盲人念诗。 
昔邵公称∶ 公卿献诗，师箴瞍赋 。
In the past, Duke Zhao said: Poems are presented by high officials, precepts are given by those in charge of education, and poems are recited by the blind.