From a Facebook thread: I think the more people read well-written things (of any kind) the more they see things that they could do and do better in their own writing. It has to do with reading as a writer--looking for techniques in other people's best writing, saying "What can I add to my writer's toolkit from this excellent piece I'm reading?" Also, getting past the stage of relying on what comes easily as a writer and getting out into new territory, deeper water. Taking on more complex writing projects that you give yourself or that school or a job asks of you. I'm convinced that a person can grow as a writer for decades, if that's what the writer commits to do.