John 10:4-5
John 10:4 The sheep follow him: for they know his voice. Also literally true in the East as all travelers testify, but a stranger they will not follow, because his voice is strange. So true is it that when a traveler has changed dress with the shepherd for an experiment, they still have followed the disguised shepherd's voice and refused to listen to the voice of a stranger in the garb of their own shepherd.
