“Write with the door closed. Rewrite with the door open.” by Stephen King
The first question that comes up when I say "You should be writing" is "Who would want to read what I write?" And that's a valid question because why write something if no one is ever going to read it? Sure, you could scrawl away for hours a night in a million notebooks, but that's more "crazy person hatching plans" than "being a writer." When you are trying to write, you must remember the audience you are writing to.

