《论衡·卷二十九·对作篇》
宝玉和石头混杂在一起，一般人不能识别；就像楚国的玉尹把宝玉当作石头，终于使卞和遭受了刖足的刑罚。
玉乱於石，人不能别。或若楚之王尹以玉为石，卒使卞和受刖足之诛。
Jade and stone are mixed together, and ordinary people can't distinguish them, just like the Jade Yin of the Chu State regarded jade as stone, which finally made Bian He suffer the punishment of amputating his feet.