Li Bai is a great poem in Tang Dynasty.
It is said that he was fond of playing and afraid of difficulties, and he made slow progress in study when he was a child.
One day, he saw an old lady grinding a very thick iron rod when he walked by a river on his way home. He felt so strange that he went to the lady and asked her, "Grannie, what do you want to do to grind the iron rod?"
The old lady replied, "Grind the iron rod into a needle."
Then, Li Bai felt stranger, and asked, "How can you grind such a thick iron rod into a needle?"
The old lady told him, "Yes, it does work! If you work hard enough, you can grind an iron rod into a needle. "
Li Bai immediately understood a lot after hearing these words.
Since then, Li Bai studies very hard and made great progress. He became a famous poem finally.