An old rabbi asked his pupils how they could tell when the night had ended and the day had begun. "Could it be," asked one student, "when you can see an animal in the distance and tell whether it's a sheep or a dog?" "No," answered the rabbi. Another asked, "Is it when you can look at a tree in the distance and tell whether it's a fig tree or a peach tree?" "No," answered the rabbi. "Then when is it?" the pupils demanded. "It is when you can look on the face of any person and see that it is your sister and brother. Because if you cannot see this, it is still night."