When the Bible refers to us as sheep, it is no compliment; they are not the brightest of God's creatures. A sheep will literally follow its own nose off a cliff. Before sheep need food and water, they need a shepherd. And we, the Bible tells us, are just like that.
If this is true, then God knows we need a shepherd; so He sent us His Son, the Good Shepherd, to care for us, feed us, water us, and protect us.
-- Michael Card, The Parable of Joy