"Sheep are absolutely hopeless without a shepherd:
that is a part of their foolishness.
They do not have the understanding that the shepherd has. They do not know where to go to find pasture,
so they are not adequately fed.
They are thin and scraggly and are fainting
because they do not know where the best pasture is to be found."

(Martyn Lloyd-Jones, "The Christ-centered Preaching of Martyn Lloyd-Jones")