George Adam Smith, the 19th century biblical scholar, tells of traveling one day in the Holy Land and coming across a shepherd and his sheep. He fell into conversation with him and the man showed him the "fold" into which the sheep were led at night. It consisted of four walls, with a way in. Smith asked him, "This is where they go at night?"
"Yes," said the shepherd, "and when they are in there, they are perfectly safe."
"But there is no door," said Smith.
"I am the door," said the shepherd. He was not a Christian man and wasn't speaking in the language of the New Testament. He was speaking from a Bedoin shepherd's viewpoint.
Smith looked and him and asked, "What do you mean you are the door?"
"When the light has gone," said the shepherd, "and all the sheep are inside, I lie in that open space, and no sheep ever goes out but across my body, and no wolf comes in unless he crosses my body; I am the door."
"Jesus therefore said unto them again, 'Verily, verily, I say unto you, I am the door of the sheep. All that came before me are thieves and robbers: but the sheep did not hear them. I am the door. By me, if any man enters in, he shall be saved, and shall go in and go out, and shall find pasture. The thief comes only to steal, and kill, and destroy: I have come that they might have life, and may have it more abundantly. I am the good shepherd: The Good Shepherd lays down his life for the sheep.'" (John 10:7-11)