"But I wonder," he added. "Would you ever ask me to do such a thing, Amir agha?" And, just like that, he had thrown at me his own little test. If I was going to toy with him and challenge his loyalty, then he'd toy with me, test my integrity.

I wished I hadn't started this conversation. I forced a smile. "Don't be stupid, Hassan. You know I wouldn't."

Hassan returned the smile. Except his didn't look forced. "I know," he said. And that's the thing about people who mean everything they say. They think everyone else does too.

- From The Kite Runner, Khaled Hosseini.