The power to cause pain is the only power that matters, the power to kill and destroy, because if you can't kill then you are always subject to those who can, and nothing and no one will ever save you.
I think Santa Claus is, by and large, quite beneficial, for when the child is finally allowed -- or forced -- to recognize the nonexistence of Santa Claus, then the child is able to go through the vital intellectual process of reconstructing reality in light of new evidence, complete with back-forming new stories to account for past events. This prepares the child for many other disillusionments and gives her vital and well-supported experience in maintaining her grip on reality independent of the stories told to her at any given time.
ORSON SCOTT CARD, Lost Boys
In creating the strange milieu in which your story takes place, you must first understand as well as you possibly can the familiar milieu in which your own life is taking place. Until you have examined and comprehended the world around you, you can't possibly create a complex and believable imaginary world.
ORSON SCOTT CARD, How to Write Science Fiction and Fantasy
You grow a whole lot more as a writer by getting old stories out of the house and letting new ones come in and live with you until they grow up and are ready to go. Don't let the old ones stay there and grow fat and cranky and eat all the food out of the refrigerator. You have dozens of generations of stories inside you, but the only way to make room for the new ones is to write the old ones and mail them off.
ORSON SCOTT CARD, How to Write Science Fiction and Fantasy
At some point, every science fiction and fantasy story must challenge the reader's experience and learning. That's much of the reason why the genre is so open to experimentation and innovation that other genres reject--strangeness is our bread and butter. Spread it thick or slice it thin, it's still our staff of life.
ORSON SCOTT CARD, How to Write Science Fiction and Fantasy
Personal affection is a luxury you can have only after all your enemies are eliminated. Until then, everyone you love is a hostage, sapping your courage and corrupting your judgment.