A person of the state of Song named Er Shuo was noted for his eloquence(口才，雄辯) at his times. On one from the famous She Xia school of the state of Qi could defeat him in his argument that "a white horse is not a horse".

Nevertheless when he passed the pass riding his white horse, he would pay the horse-passing tax and never argued with those guards that a white horse is not a horse.

宋國人兒說能言善辯著名于時，當他堅持‘白馬非馬’這一學術觀點時，齊國著名的稷下學派沒有一個人能駁倒他的觀點。

然而，他騎白馬通過關卡時，還是如數交納馬匹過關費，并不和關卡的官吏爭執白馬是不是馬。