《魏书·列传·卷十九》
我们在地方时，关注国家大事，书信往来讥刺，愤恨成病。伤害礼教败坏道德，于忠就是祸首。
臣等在蕃之时，乃心家国，书诮往来，愤气成疚，伤礼败德，臣忠即主。
When we were in the provinces, we paid attention to the important affairs of state, made sarcastic remarks in our correspondence, and became ill with resentment. Yu Zhong was the leader in damaging the rites and ethics.