《论衡·卷二十七·定贤篇》
道家与贤人所以不同类，在于贤人忧伤世道而企图拯救世人脱离苦难，因此孔子日夜忙碌，墨子匆忙不安。
道人与贤殊科者，忧世济民於难。是以孔子栖栖，墨子遑遑。
The difference between Taoism and sages is that sages worry about the world and try to save the world from suffering, so Confucius is busy day and night, and Mozi is in a hurry and uneasy.