“Let me set this before you as plainly as I can. If a person climbs over or through the fence of a sheep pen instead of going through the gate, you know he’s up to no good—a sheep rustler! The shepherd walks right up to the gate. The gatekeeper opens the gate to him and the sheep recognize his voice. He calls his own sheep by name and leads them out. When he gets them all out, he leads them and they follow because they are familiar with his voice. They won’t follow a stranger’s voice but will scatter because they aren’t used to the sound of it.”