There is only one way to avoid criticism: do nothing, say nothing, and be nothing. -Aristotle (i. you can't avoid criticism so you must just learn to accept it and go on with your life. Accept yourself flaws and all).
The book was dedicated to C.S Lewis' niece, I think, Lucy. The dedication said something like this "I started this book when you were young enough to read fairy tales, but someday you will be old enough to start reading fairy tales again.