Imagine A Mystical Limpet

From Miracles, by CS Lewis

Why are many people prepared in advance to maintain that, whatever else God may be, He is not the concrete, living, willing, and acting God of Christian theology? I think the reason is as follows. Let us suppose a mystical limpet, a sage among limpets, who (rapt in vision) catches a glimpse of what Man is like. In reporting it to his disciples, who have some vision themselves (though less than he) he will have to use many negatives. He will have to tell them that Man has no shell, is not attached to a rock, is not surrounded by water. And his disciples, having a little vision of their own to help them, do get some idea of Man. But then there come erudite limpets, limpets who write histories of philosophy and give lectures on comparative religion, and who have never had any vision of their own. What they get out of the prophetic limpet's words is simply and solely the negatives. From these, uncorrected by any positive insight, they build up a picture of Man as a sort of amorphous jelly (he has no shell) existing nowhere in particular (he is not attached to a rock) and never taking nourishment (there is no water to drift it towards him). And having a traditional reverence for Man they conclude that to be a famished jelly in a dimensionless void is the supreme mode of existence, and reject as crude, materialistic superstition any doctrine which would attribute to Man a definite shape, a structure, and organs.