"But the demons will beat Moon Shadow," Mother protested.
"They don't do that so much anymore." Hand Clap carefully wiped his sticky fingers on his tunic sleeve. "And they wouldn't do it to a child. Even the demons have some principles." (1.27-28)
[...F]or Grandfather, having a queue was part of being a Tang man. He would as soon lose his nose as his queue. But even if he had been a revolutionary who knew what the queue really meant and hated the thought of wearing it, there was still the principle of the matter." (4.14)
"Here, John." The demon unbuttoned his coat and reached into his pants pocket, but father shook his head.
"No tip. Happy just to look at horseless."
The demon stopped and studied Father as you might look at a dog that had suddenly said he was going to the opera. "Well, I'll be damned," he said. He reached into a pocket of his waistcoat and took out a card, and handed it to Father with a flourish. "I can use honest handymen like you. You come around anytime, you sabe me?" (4.45-47)