古时，有一位名叫李白的年轻人，他天资聪颖，却因年少轻狂而疏于学业。一日，他外出游玩，来到一座山中，见一老妇人正坐在溪边专心致志地磨一根粗大的铁杵。

李白好奇地问：“老奶奶，您为何要将如此坚硬的铁杵磨成细针呢？这岂非徒劳无功吗？”

老妇人闻言微微一笑，答道：“只要功夫深，铁杵定能磨成针。”

李白听后深受触动，顿悟到学习之道在于持之以恒，而非急功近利。从此，他潜心苦读，最终成为唐代著名的诗人，留下了许多流传千古的诗篇。

译文：

In ancient times, there was a young man named Li Bai who was gifted but frivolous in his youth. One day, while traveling in the mountains, he saw an old woman sitting by the stream, diligently grinding a thick iron rod into a needle.

"Grandma," Li Bai asked curiously, "why are you trying to turn such a hard iron rod into a needle? Isn't this a waste of effort?"

The old woman smiled and replied, "As long as one works hard enough, an iron rod can surely be ground into a needle."

After hearing these words, Li Bai was deeply moved and realized that learning requires perseverance rather than impatience. From then on, he devoted himself to studying and eventually became a renowned poet of the Tang Dynasty, leaving behind many timeless poems for posterity.

通过这个故事，我们明白了无论做什么事情，都需要坚持不懈的努力才能取得成功。正如那句古话所说：“世上无难事，只怕有心人。”