BuyingshoesAmanofthestateofZhengwantedtobuyapairofshoes.Hemeasuredhisfootandputthemeasurementonachair.Whenhesetoutforthemarketheforgottobringitalong.Itwasafterhehadfoundthepairhewantedthatthisoccurredtohim.Iforgotthemeasurement,saidhe.Hewenthometogetitbutwhenhereturnedthemarkethadbrokenupandhedidnotgethisshoesafterall.Whydidn'tyoutryontheshoeswithyourfeet?Hewasasked.I'drathertrustthemeasurementthantrustmyself.(《Hanfeizi》)郑人买履从前,郑国有个人想买双鞋.他量好了自己脚的尺码,把它放在了椅子上.可当他赶往市集时,却忘了带量好的尺码.他要买鞋时,才想了起来.他说："我忘带尺码了."他回家去取量好的尺码.等他赶回来时,市集已经关了,他还是没能买到鞋.有人问："为什么不用你自己的脚去量鞋子呢?"他说："我宁愿相信尺码也不相信我自己的脚."(《韩非子》)