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During the Tang Dynasty, the famous poet Li Bai was not a diligent student in his youth. He often threw his books aside and went out to play.
One day, Li Bai encountered an old woman with white hair who was grinding a large iron pestle on a stone. Curious, he asked her what she was doing.
The old woman told him she was trying to grind it into an embroidery needle.
Deeply moved by her perseverance, Li Bai studied hard from then on and eventually became a great literary figure.

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Open the tool →铁杵磨成针 (tiě chǔ mó chéng zhēn) is a Chinese idiom (chengyu) meaning “to achieve success through persistent effort and perseverance”.
铁杵磨成针 is pronounced tiě chǔ mó chéng zhēn in Mandarin Chinese.
Literally, 铁杵磨成针 means “an iron pestle ground into a needle”. It is used to mean “to achieve success through persistent effort and perseverance”.
铁杵磨成针 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
杵:舂米或捶衣用的棒。将铁棒磨成细针。比喻只要有恒心,肯努力,做任何事情都能成功。