Describing impetuous ancient poems and sentences

The reeds on the wall are top-heavy and have shallow roots.

Bamboo shoots in the mountains have a thick mouth and an empty stomach.

It is said that a scholar, with a shallow knowledge, did not believe that Jie Jin, whose family was poor, could write couplets, so he ironically read a well-known couplet: "The cow can't outrun the donkey, but the horse can't outrun it; Chickens fly ducks, but they can't fly eagles. " And commented on Jie Jin. Jie Jin saw that the scholar was so shallow and wanted to ridicule others, so he read a couplet for the scholar. Hearing this, the scholar blushed and left despondently. Comrade Mao Zedong quoted Jie Jin's couplets in "Rewarding Scholars".

But this is just a legend. I believe this is just a proverb, which was created by unknown people and finally attached to Jie Jin, a great genius.

Later, Mao Zedong quoted this famous couplet, and in the article "Transforming Our Learning", he quoted it to educate those cadres who only talk big and have no real talents. So, who is the author of this couplet? Jie Jin, a scholar, was good at fighting when he was a teenager.

The beauty of this pair of couplets is that the author draws a cartoon image for those ignorant and pretentious people in a metaphorical way. At the same time, word pairs are very stable, easy to understand and appropriate.