《淮南子·缪称训》
所以只是通晓一种技艺、只能分辨片言只语的真伪，这样的人只能与他说些浅陋的道理，而不能与他作广泛的应对。宁戚敲击牛角而悲歌，感动了齐桓公，被齐桓公任命为大田官。雍门子以哀歌使孟尝君悲从心起，流下眼泪以至打湿帽带。
宁戚击牛角而歌，桓公举以大政；雍门子以哭见孟尝君，涕流沾缨。
Someone who only knows one skill, and can only identify pieces of words and phrases, can only have shallow communication with others, and cannot have extensive discussions with them. Ning Qi played a sad song on his ox horn, and moved Qi Huan Gong. Qi Huan Gong appointed him as the Minister of Farming. Yong Men Zi made Meng Chang Jun shed tears with his sad song and wet his hat ribbons.