Don't use words too big for the subject. Don't say 'infinitely' when you mean 'very'; otherwise you'll have no word left when you want to talk about something really infinite.
Even in literature and art, no man who bothers about originality will ever be original: whereas if you simply try to tell the truth (without caring twopence how often it has been told before) you will, nine times out of ten, become original without ever having noticed it.
It's not enough to create magic. You have to create a price for magic, too. You have to create rules.
Write something to suit yourself and many people will like it; write something to suit everybody and scarcely anyone will care for it.
The way you define yourself as a writer is that you write every time you have a free minute. If you didn't behave that way you would never do anything.