"A Russian cosmonaut and a Russian brain surgeon were once discussing Christianity. The brain surgeon was a Christian, but the cosmonaut wasn't. 'I have been in outer space many times,' bragged the cosmonaut, 'but I have never seen any angels.' The brain surgeon stared in amazement, but then he said, 'And I have operated on many intelligent brains, but I have never seen a single thought.'"
- Jostein Gaarder