The story is told of a rabbi in ancient times who gathered his students together very early one morning, while it was still dark. He put this question to them: “How can you tell when night has ended and the day has begun?”
One student made a suggestion. “Could it be when you can see an animal and you can tell whether it is a sheep or a goat?”
“No, that’s not it,” answered the rabbi.
Another student said, “Could it be when you look at a tree in the distance and you can tell whether it is a fig tree or a peach tree?”
Again the rabbi answered, “No.”