只要功夫深，铁杵磨成针
zhi3 yao4 gong1 fu5 shen1 , tie3 chu3 mo2 cheng2 zhen1
只要功夫深，鐵杵磨成針
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If you work at it hard enough, you can grind an iron bar into a needle./cf idiom 磨杵成針|磨杵成针, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task/to study diligently