"I am going to grind this pestle into a needle to sew cloth with," answered the old woman.
The child laughed, "But this is such a big pestle, how can you hope to grind it down to a needle?"
"It doesn't matter," replied the old woman. "Today I grind it, tomorrow I'll grind it again, and the day after tomorrow again. The pestle will get smaller every day, and one day it will be a needle."
The child saw the point and went to school."
-Ch'en Len-Shi