只ㄓˇzhǐ要ㄧㄠˋyào功ㄍㄨㄥgōng夫ㄈㄨfū深ㄕㄣshēn，鐵ㄊㄧㄝˇtiě杵ㄔㄨˇchǔ磨ㄇㄛˊmó成ㄔㄥˊchéng針ㄓㄣzhēn

（諺語）比喻只要有恆心毅力，肯下功夫，就能把事情做成功。《通俗常言疏證·文事·若要功夫深鐵也磨成針》引《通俗編》：「宋鄭思省百二十圖詩有一題云：『驪山老姥磨鐵杵，欲作繡針圖。』今俗語云：『只要功夫深，鐵杵磨成針。』即本于此。」

英If you work at it hard enough, you can grind an iron bar into a needle., cf idiom 磨杵成針, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task, to study diligently