In fact, I don't even call myself an actor. I'm a reactor. I listen to what to what the other guys says and I react to it. That's the John Wayne method.
Source, in full
Speaking in 1958 with Charles Hamblett; as quoted in The Hollywood Cage (1969) by Hamblett, reproduced in "The Hollywood Cage': Wayne Has Method, Goldwyn Has Hope, Welles Has Wasteland" by Hamblett, The Philadelphia Inquirer (May 4, 1969), p. 109