Quentin Bell’s biography told the story of his aunt, who happened to be the famous writer Virginia Woolf. But it was a family story really, about a woman with psychotic episodes, her husband’s coping with this, her sister’s distress. It had, as I said, the smell of a household. It was not about the sentences in Virginia Woolf’s books. The Wharton biography, though more a “literary” biography, dealt with status, not with the writer’s private heart. What do I mean by “private heart”? It’s probably impossible to define, but it’s not what the writer does—breakfast, schedule, social outings—but what the writer is. The secret contemplative self. An inner recess wherein insights occur. This writer’s self is perhaps coextensive with one of the writer’s sentences. It seems to me that more can be found about a writer in any single sentence in a work of fiction, say, than in five or ten full-scale biographies. Or interviews!
-Cynthia Ozick,  "The Art of Fiction No. 95," The Paris Review