I love this quote by Goodreads author Ally Condie:
"There's this great Ann Patchett quote about the idea of the book being this beautiful butterfly, and it's flying around you and it's lovely and you have a wonderful time thinking about it. (I'm paraphrasing, obviously—she says it much more elegantly than this.) And she says that when you sit down to write, you're basically killing that butterfly and pinning it to a display case. Her description made me laugh because it is kind of true for me. Once you start to write your beautiful idea, you have to deal with your own shortcomings. That's the part that is the hardest about writing, and it can be scary—dealing with your demons, your insecurities, your worry that what you have on paper will never live up to what you imagine—but it's also the best part, because it's how you become a better writer. "