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During the Tang Dynasty, the renowned literary figure Han Yu, while serving as Libationer of the Imperial College, often lectured to his students.
He emphasized that 'excellence in studies is achieved through diligence and ruined by idleness; character is formed through reflection and destroyed by thoughtlessness.'
He also urged them to engage in social practice, encouraging them to be inclusive and learn from everything. He famously stated that 'ox urine and horse puffball, even the skin of a broken drum,' all have their uses, thereby encouraging students to strengthen their learning and apply knowledge flexibly.

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Open the tool →牛溲马勃 (niú sōu mǎ bó) is a Chinese idiom (chengyu) meaning “Seemingly worthless or humble things that can be valuable or useful when properly understood and applied, especially in the hands of an expert”.
牛溲马勃 is pronounced niú sōu mǎ bó in Mandarin Chinese.
Literally, 牛溲马勃 means “Ox urine and horse puffball”. It is used to mean “Seemingly worthless or humble things that can be valuable or useful when properly understood and applied, especially in the hands of an expert”.
牛溲马勃 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
牛溲:牛尿,一说车前草,利小便;马勃:可治疮。比喻一般人认为无用的东西,在懂得其性能的人手里可成为有用的物品。