只要功夫深，铁杵磨成针

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

한국어 뜻 준비 중 – 영어 뜻