只要功夫深， 铁杵磨成针

只要功夫深， 铁杵磨成针 [zhǐ yào gōng fu shēn tiě chǔ mó chéng zhēn]

1. ■ Constant grinding can turn an iron rod into a needle; Constant dropping wears away a stone.; if you work at it hard enough, you can grind an iron rod into a needle -- perseverance spells success.; Little strokes fell great oaks.; With time and patience the leaf of the mulberry becomes satin.