Mathematicians have shown us we can never close a logical system upon itself. Our knowing is, and will remain, flawed and incomplete. Knowledge will always contain double meanings. One more surprise lurks in anything we think we know. Learning harbors surprise, and surprise is delight.
Surprise is laughter.
New meanings bubble within any human knowledge. So, in the end, learning is delight after all. New York, Harper Collins Pubs., 1991.