There’s a great account of G. Campbell Morgan meeting Old Testament scholar Sir George Adam Smith while traveling across the Atlantic ocean. Sir George told him this story regarding sheep.
He was one day traveling with a guide, and came across a shepherd and his sheep. He fell into conversation with him. The man showed him the fold into which the sheep were led at night. It consisted of four walls, with a way in. Sir George said to him, “That 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 Sir George. “I am the door,” said the shepherd. He was not a Christian man, he was not speaking in the language of the New Testament. He was speaking from the Arab shepherd’s standpoint. Sir George looked at him and said, “What do you mean by the door?” Said the shepherd, “When the light has gone, and all the sheep are inside, I lie in the 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.”