《汉书·传·董仲舒传》
有入说： 良玉不需要雕琢， 有人说 没有文采就不能辅助德行， 两种说法是不同的。
或曰良玉不瑑，又曰非文亡以辅德，二端异焉。
One says: Good jade does not need carving. Another says: One who is not literary cannot assist in morality. The two sayings are different.