There's an unwritten compact between you and the reader. If someone enters a bookstore and sets down hard earned money (energy) for your book, you owe that person some entertainment and as much more as you can give.
A ruler must learn to persuade and not to compel.
Education is no substitute for intelligence.
Kindness is the beginning of cruelty.
Is evolution just another name for God?
The most terrifying things in the universe came from human minds.