Lewis makes a statement defining religion that is somewhat revolutionary. As I ponder this concept, I had to consider what a religion should be. It seems it should be a doctrine that encompasses all truth and rejects falsehood thereby enlightening its believers. Another insight I received was on page 43 of The Great Divorce. It will hurt at first, until your feet are hardened.
Reality is harsh to the feet of shadows.
This is a very interesting insight C. S. Lewis had. The mountains throughout all scripture either represent a temple or other sacred places-but in every case somewhere an individual may go to draw nearer to God. As we draw near to God and come to feel realities, it is painful. Notice that the ghost has the option of rejecting the invitation and living in ignorance or learning truth and feeling the pain that comes with knowing one's own mistakes but the ultimate gratification of being enlightened. I am afraid the only safe rule is to give more than we can spare.