A year or so ago I wrote that the writer asks the same question as the philosopher: why?
I still believe that. But I'd like to add something to it: it is the goal of the writer to explore the nature of what is. He must present fully all that is within the world and within our hearts. That way, the reader will encounter truth.
I would not have realized this, by the way, if it had not been my study of some of the work of William F. Lynch, S.J. He changed my approach to both literature and writing.