tiě​chǔ​mó​zhēn

steady effort yields success

Senses

铁杵磨针/ 鐵杵磨針 tiě​chǔ​mó​zhēn steady effort yields success

Grind a metal rod into a needle; used to describe how persistence and steady effort can achieve even the most difficult tasks or work miracles.

References

variant 铁杵磨针/鐵杵磨針 铁杵磨成针/鐵杵磨成針