《后汉书·列传·郑范陈贾张列传》
现在陛下草创天下，纪纲尚未定立，虽设学官，没有弟子，《诗书》不讲，礼乐不修，奏立《左氏》、《费氏》，不是当务之急。孔子说： 攻乎异端，斯害也已。 
今陛下草创天下，纪纲未定，虽设学官，无有弟子，《诗》、《书》不讲，礼乐不修，奏立《左》、《费》，非政急务，孔子曰： 攻乎异端，斯害也已。 
Now that Your Majesty has created the world, the discipline has not yet been established, even if there is a school official, there are no disciples, "Poetry and History" are not taught, etiquette and music are not cultivated, and the establishment of "Zuo's" and "Fei's" is not urgent. Confucius said: Attacking heresy is harmful.