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“The shepherd is a guide. Sheep are not independent travelers. They must have a human conductor. They cannot go to predetermined places by themselves. They cannot start out in the morning in search of pasture and then come home at evening time. They have, apparently, no sense of direction. The greenest pasture may be only a few miles away, but the sheep left to themselves cannot find it. What animal is more incapable than a sheep? He realizes his impotence for no animal is more docile. Where the shepherd leads, the sheep will go. He knows that the shepherd is a guide and that it is safe to follow him. The shepherd cannot drive the sheep, he must lead them. Mules and hogs can be driven, but not sheep; their nature is to follow.”