When you are physically blind, you know that you are blind, and you do things to compensate for this significant physical deficit. But spiritually blind people are not only blind; they are blind to their own blindness. They are blind, but they think that they see well. So the spiritually blind person walks around with the delusion that on one has a more accurate view of him than he does. He thinks he sees and is unaware of the powerfully important things in his hear that he absolutely does not see at all.