“Any wizard bright enough to survive for five minutes was also bright enough to realize that if there was any power in demonology, then it lay with the demons. Using it for your own purposes would be like trying to beat mice to death with a rattlesnake.”

“What's a philosopher?' said Brutha.Someone who's bright enough to find a job with no heavy lifting,' said a voice in his head.”

“Hell needed horribly bright, self-centered people like Eric. They were much better at being nasty than demons could ever manage”

“The fact was that, as droves of demon kings had noticed, there was a limit to what you could do to a soul with, e.g., red-hot tweezers, because even fairly evil and corrupt souls were bright enough to realize that since they didn't have the concomitant body and nerve endings attached to them there was no real reason, other than force of habit, why they should suffer excruciating agony. So they didn't. Demons went on doing it anyway, because numb and mindless stupidity is part of what being a demon is all about, but since no one was suffering they didn't enjoy it much either and the whole thing was pointless. Centuries and centuries of pointlessness.”

“He helped the Librarian up. There was a red glow in the ape's eyes. It had tried to steal his books. This was probably the best proof any wizard could require that the trolleys were brainless.”

“Any true wizard, faced with a sign like 'Do not open this door. Really. We mean it. We're not kidding. Opening this door will mean the end of the universe,' would automatically open the door in order to see what all the fuss is about. This made signs rather a waste of time, but at least it meant that when you handed what was left of the wizard to his grieving relatives you could say, as they grasped the jar, 'We told him not to.”

“I'm trying to remember how you tell the time by looking at the sun." -"I should leave it for a while, it's too bright to see the numbers at the moment.”