《魏书·帝纪·卷十一》
又下诏说： 道理衹有一个标准，民众就没有非分的意图；法令出自不同途径，官吏就作威作福。
又诏曰： 理有一准，则民无觊觎；法启二门，则吏多威福。
It was also declared by decree: When the Way has only one standard, the people have no ulterior intentions; when laws come from different sources, government officials engage in despotism.