Choices are both conscious and subconscious. The conscious choices towards an idealized persona can – to a discriminating eye – reveal the subconscious personality or state-of-mind that produced those choices. Over time, patterns and themes become more recognizable.
If you contextualize an author’s body of work along patterns and themes in characters and the courses of their stories, the pieces of life that most drive the author are laid bare. And in a culture in which we are all generating consumable content, everyone is an author.