《水经注·卷二十六》
《淮南子》说：白公问孔子对含义至深的隐微之言的看法，说：如果把水倒入水中，又会怎么样份。
《淮南子》曰：白公问微言曰：若以水投水，如何？
The "Huainan Zi" states: Duke Bai asked Confucius for his view on the profound and mysterious words of great meaning, stating: if you pour water into water, how is it then.