《资治通鉴·魏纪·魏纪二》
明帝开始主持政事，陈群上书说： 大臣随声附和，是非不分，是国家的大祸害。
帝初莅政，陈群上疏曰： 夫臣下雷同，是非相蔽，国之大患也。
When Emperor Ming began to preside over government affairs, Chen Qun submitted a memorial saying: The ministers follow along and agree, and they do not distinguish between right and wrong, which is a great disaster for the country.