Tim O'brien said this quote

Whenever he told the story, Rat had a tendency to stop now and then, interrupting the flow, inserting little clarifications or bits of analysis and personal opinion. It was a bad habit, Mitchell Sanders said, because all that matters is the raw material, the stuff itself, and you can’t clutter it up with your own half-baked commentary. That just breaks the spell. It destroys the magic. What you have to do, Sanders said, is trust your own story. Get the hell out of the way and let it tell itself.