《论衡·卷二十·佚文篇》
周、秦时代，诸子都在著书立说，论述的全是其他事情，没有称颂帝王的，对国家没有什么好处，对于教化也没有什么补益。
周、秦之际，诸子并作，皆论他事，不颂主上，无益於国，无补於化。
During the Zhou and Qin Dynasties, the philosophers all wrote books and established theories, which discussed other things. There were none to praise the emperor, which was not good for the country or for education.