He has a literary quote on his wall

"I have a quote here on my wall by Henry James in which he says, 'We work in the dark, we do what we can, we give what we have. Our doubt is our passion, and our passion is our task. The rest is the madness of art.'

"It's a wonderful quote. You kind of struggle along and hope for the best. If something works, you have no idea why. And you have no idea if it does work anyway. Honestly, no one's going to have a clue if this book is worth reading or not in 75 years. Literary history is littered with books that were huge successes when they came out and got completely forgotten in five years, and also with books that were completely ignored when they came out and are now the greatest classics of literature. Like Moby-Dick. So who knows?"

Seems like a real writer is talking. Can you guess who it's?