In today‘s New York Times.
“I know I’m not going to write as well as I used to. I no longer have the stamina to endure the frustration. Writing is frustration — it’s daily frustration, not to mention humiliation. It’s just like baseball: you fail two-thirds of the time.” He went on: “I can’t face any more days when I write five pages and throw them away. I can’t do that anymore.”