On Unread Books by Umberto Eco
This article has been published on the Paris Review website. It begins:
I recall, though my recollection may be faulty, a magnificent article by Giorgio Manganelli explaining how a sophisticated reader can know whether a book is worth reading even before he opens it. He wasn’t referring to the capacity often required of a professional reader, or a keen and discerning reader, to judge from an opening line, from two pages glanced at random, from the index, or often from the bibliography, whether or not a book is worth reading. This, I say, is simply experience. No, Manganelli was talking about a kind of illumination, a gift that he was evidently and paradoxically claiming to have.
You can continue reading the full article on this link to The Paris Review