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I am not very good at remembering who said what. And I've probably got this quote wrong, but it's interesting nonetheless. Here goes:

All novels are, in some way, about the novel-writing process.

I think the rationale was that because it takes so long to write a novel, and that it dominates your life to such an extent, you can't fail to refer to or write about the process, subconsciously or otherwise, somewhere along the way.