Parable of the Good Shepherd
Truly, truly, I say to you, he who does not enter by the door into the fold of the sheep, but climbs up some other way, he is a thief and a robber.
But he who enters by the door is a shepherd of the sheep.
To him the doorkeeper opens, and the sheep hear his voice, and he calls his own sheep by name and leads them out.
When he puts forth all his own, he goes ahead of them, and the sheep follow him because they know his voice.
A stranger they simply will not follow, but will flee from him, because they do not know the voice of strangers.