Long ago, there was a famous poet who lived during China's Tang Dynasty. His name as Li Bai and it was said that when he was young, he did not like studying. He would often abandon his classes to play outside.
One day, he met an old lady who was grinding an iron bar against a stone. Curious, he asked her what she was doing. The old lady told him that she wanted to make a needle from the iron bar. Moved by her perseverance, he became determined to return to his studies with renewed focus.
Thus the saying, 只要功夫深，铁杵磨成针 (With perseverance, even iron can be ground into needle), became a Chinese proverbial saying.