the snail and the laughing sparrow
When asked if he was ever discouraged by the little fruit his efforts seemed to yield, the Master told the story of a snail that started to climb a cherry tree one cold, windy day in late spring.
The sparrows in a neighboring tree had a good laugh at his expense. Then one flew over and said. "Hey, stupid: don't you know there are no cherries on this tree?"
The little fellow did not stop as he replied, "Well, there will be when I get there."