As long as you work hard, an iron pestle can be ground into a needle

It is a metaphor that as long as you are determined and willing to work hard, you can succeed in anything no matter how difficult it is. It is a word of praise and can be used as a predicate, object, attributive, and adverbial. Written by He Yihao, "Mu Lian Saves His Mother: Liu Shi Zhai Ni" by Zheng Zhizhen of the Ming Dynasty: "It's like an iron pestle grinding a needle, a strong heart will make the needle sharp."

Allusion

Li Bai, the famous poet of the Tang Dynasty, did not like studying when he was a child. He often skipped school and wandered on the streets. One day, Li Bai did not go to school again. He wandered around the street and looked here and there, and unknowingly arrived outside the city. The warm sunshine, cheerful birds, and flowers and plants swaying in the wind made Li Bai sigh, "With such good weather, how boring would it be to read in the house all day?" As he walked, he came across a man sitting at the door of a broken thatched hut. The old woman with white hair was grinding an iron pestle as thick as a stick. Li Bai walked over and said, "Old woman, what are you doing?" "I want to grind this iron pestle into an embroidery needle." The old woman raised her head, smiled at Li Bai, and then lowered her head to continue grinding. "Embroidery needle?" Li Bai asked again: "Is it an embroidery needle used for sewing clothes?" "Of course!" "But the iron pestle is so thick, when will it be ground into a thin embroidery needle?" The old woman asked Li Bai: " A drop of water can penetrate a stone, and a foolish old man can move a mountain. Why can't an iron pestle be ground into an embroidery needle? " "But you are so old? " " As long as I work harder than others, there is nothing I can't do. "The old woman's words made Li Bai very ashamed, so after he returned, he never skipped school again. I also studied very hard every day, and finally became a poet who will be famous throughout the ages.