During World War II, the English government knew that Hitler was planning to invade the British Islands. They encouraged their people to prepare for the invasion and they did several things: they boasted their defenses, they put guards on constant watch, and they developed early warning systems and evacuation routes.
They did one more thing - the government passed a law requiring every community to take down all the road signs and any sign that named any town or village. They knew the Germans had maps of England, but if they couldn't locate themselves on those maps, they would be slowed in their progress as they approached London. Without any sign or any point of reference, the troops would just wander aimlessly around.
The world does that to us. It takes our roads signs away. And we live our lives lost; not knowing where we are and don't know how to get to where we need to go, so husbands and wives will wander away from their marriages. Children will wander away from their parents. People will walk off cliffs of drugs, alcohol, or materialism. Sheep need guidance. We need direction and leadership.
That is the job of the shepherd. What is the second verse in the twenty-third Psalm? "He makes me lie down in green pastures; He leads me beside quiet waters."