'This has been the story of your life ... Whenever you come to a fork in the road, your body breaks down, for your body has always known what your mind doesn’t know … your body has always borne the brunt of your fears and inner battles.' Thirty years after The Invention of Solitude, Paul Auster returns to memoir - though he says he prefers to think of the book as a collection of autobiographical fragments. Here is the Brooklyn author reading an extract.