Writing is a process and revision is the most important (and difficult part): Writers create text, good or bad, and are staring at the Grand Canyon of "what next?". Then they revise and then editors step in and then publishers publish. 

People who don't write a lot assume that writers just pop off novels and news articles and haiku and so on, but that's not the way the process works. What they don't know, and what writers and editors do know, which is that it's a journey and both sides are willing to end up somewhere they most likely didn't expect. 

Jackson