Science fiction is about what could be but isn't; fantasy is about what couldn't be.
Orson Scott CardThe difference between raman and varelse is not in the creature judged, but in the creature judging. When we declare an alien species to be raman, it does not mean that they have passed a threshold of moral maturity. It means that we have.
Orson Scott CardOh, Val," said Father. "All you have to do is live your life, and everyone around you will be happier." "No greatness, then." "Val," said Mother, "goodness trumps greatness any day." "Not in the history books," said Valentine. "Then the wrong people are writing history, aren't they?" said Father.
Orson Scott Card