At night, when the objective world has slunk back into its cavern and left dreamers to their own, there come inspirations and capabilities impossible at any less magical and quiet hour. No one knows whether or not he is a writer unless he has tried writing at night.
To invent out of knowledge means to produce inventions that are true. Every man should have a built-in automatic crap detector operating inside him. It also should have a manual drill and a crank handle in case the machine breaks down. If you're going to write, you have to find out what's bad for you. Part of that you learn fast, and then you learn what's good for you.
Experience of life (not of books) is the only capital usable in such a book as you have attempted; one can make no judicious use of this capital while it is new.
The good parts of a book may be only something a writer is lucky enough to overhear or it may be the wreck of his whole damn life - and one is as good as another.
Never write about a place until you're away from it, because it gives you perspective. Immediately after you've seen something you can give a photographic description of it and make it accurate. That's good practice, but it isn't creative writing.