Teaching in the Form of a Story
Truly I say to you, He who does not go through the door into the place where the sheep are kept, but gets in by some other way, is a thief and an outlaw.  He who goes in by the door is the keeper of the sheep.  The porter lets him in; and the sheep give ear to his voice; he says over the names of the sheep, and takes them out.  When he has got them all out, he goes before them, and the sheep go after him, for they have knowledge of his voice.  They will not go aft...