"It should absolutely, completely undermine who you think you are—that's the mark of art to me." David Shields discusses his writing practice and reads from his book How Literature Saved My Life (Knopf, 2013). For more on Shields, read "Art vs. Life: A Quarrel Between David Shields and Caleb Powell" in the new issue of Poets & Writers Magazine. Shields and Powell will discuss more on January 10 at the Poets & Writers Live event in San Francisco.