Leland Dirks said this quote

For a writer, it seems a help rather than a hindrance to be at least a little crazy. Who but a crazy person would carve out a very private, quiet place in the world, only to pour his/her innermost thoughts and emotions onto a page for the entire world to examine? Even in fiction, we give a map to our most secret feelings. Why do writers do it? Perhaps because we'd be crazier still if we didn't.