《论衡·卷十九·宣汉篇》
古代西北的戎狄，现在变成了中原的诸侯国；古代的裸人，现在穿上了朝服；古代光着头的人，现在戴上了帽子；古代赤足的人，现在穿上了厚底鞋。
古之戎狄，今为中国；古之裸人，今被朝服；古之露首，今冠章甫；古之跣跗，今履舄。
The Rong and Di tribes in the northwest of ancient times have now become vassal states in the Central Plains; the people who used to go naked now wear court uniforms; those who used to shave their heads now wear hats; those who used to go barefoot now wear thick-soled shoes.