The young Kuo Hsiang of the Chin dynasty was famous for his talent and brilliance. He was particularly knowledgeable on the writings of Lao-tzu and Chuang-tzu.
At that time many people asked Kuo to become a government official, but each time he politely refused. Instead, he concentrated his energies on the pursuit of knowledge and philosophical discourse, and finally became a great scholar.
Kuo was not only rich in knowledge, but also eloquent, and could clearly explain the essence of all matters. Thus, he was often praised by the magistrate Wang Yen, who stated: "Words flow easily from Kuo's mouth like the waters of a cataract that never goes dry."
Later, based on Wang Yen's words, people came to describe someone who is eloquent and convincing as having "A Mouth Like a Flowing Waterfall."
(Jill Ardourel)