喻老

In the title 喻 means 'to illustrate' and 老 is 老子, not 'old'. With the chapter before it, 解老 'Explaining Laozi', it is the oldest surviving commentary on the 道德经: here each saying is matched with a story, such as the doctor 扁鹊 warning Duke Huan of Cai that his illness was moving from the skin to the marrow, or a dike of a thousand feet breached by an ant hole, for dealing with a difficulty while it is still small.

It also tells of King Zhuang of Chu, who did nothing for three years and was compared to a bird that had not flown or sung: once it flies it will soar to the sky, once it sings it will astonish everyone, the source of 一飞冲天 and 一鸣惊人.