An interesting implication, if this generalizes: "Don't advocate the moral beliefs you think people should follow. Advocate the moral beliefs which hearing you advocate them would actually cause other people to behave better."
Just a sidenote: If you are the kind of person who is often worried about letting people down, entertaining the suspicion that most people follow this strategy already is a fast, efficient way to drive yourself completely insane.
"You're doing fine."
"Oh, I know this game. I'm actually failing massively, but you thought, well, this is the best he can do, so I might as well make him think he succeeded. DON'T LIE TO ME! AAAAH..."
Here's the new thread for posting quotes, with the usual rules: