Wise teacher: "How can we determine the hour of dawn, when the night ends and the day begins?"

"When from a distance you can distinguish between a dog and a sheep?" suggested one of the students.

"No," was the answer of the teacher.

"Is it when one can distinguish between a figtree and a grapevine?" asked a second student.

"No."

"Please tell us the answer then," said the students.

"It is," said the wise teacher, "when you can look into the face of a human being and you have enough light to recognize in him your brother. Up until then it is night and darkness is still with us."

— An old wise tale