…you owe it to your readers to set yourself the most difficult challenge that you have some hope of being equal to. With every book, you have to dig as deep as possible and reach as far as possible. And if you do this, and you succeed in producing a reasonably good book, it means that the next time you try to write a book, you’re going to have to dig even deeper and reach even farther, or else, again, it won’t be worth writing.
– Jonathan Franzen, from Farther Away
(and see James Santel’s excellent review of Farther Away)