“A Russian astronaut and a Russian brain surgeon were once discussing religion. The brain surgeon was a Christian but the astronaut was not. The astronaut said, 'I've been out in space many times but I've never seen God or angels.' And the brain surgeon said, 'And I've operated on many clever brains but I've never seen a single thought.”

“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.”

“I've nothing against eye make-up and lipstick. But the fact is that we’re actually living on a planet in space. For me that’s an extraordinary thought. It’s mind-boggling just to think about the existence of space at all. But there are girls who can’t see the universe for eye liner.”

“Dear Hilde, if the human brain was simple enough for us to understand, we would still be so stupid that we couldn't understand it. Love, Dad.”

“I'm more concerned, just as you used to be, with the world as a riddle than with the riddles in the world. I'm more concerned with natural than the supernatural. And I feel more wonder for our inscrutable brain than for all these loose anecdots about the 'extrasensory'.”

“I have gone around observing your activities from the outside. Because of this I have also been able to see things to which you have been blind... Every morning you have gone to work, but you have never been fully awake. Of course, you have seen the sun and the moon, the stars in the sky, and everything that moves, but you haven't really seen it at all. It is different for the Joker, because he was put into this world with a flaw: He sees too clearly and too much.”

“Many of the Nazis were convicted after the war, but they were not convicted for being 'unreasonable'. They were convicted for being gruesome murderers.”