When George is trying to get Lennie hired at a new work-site, he brags about his physical capabilities, saying he’s “Strong as a bull.” But the boss is suspicious because Lennie doesn’t speak for himself, and says “Then why don’t you let him answer? What are you trying to put over?” The fact that George thinks and talks for Lennie at the same time that he emphasizes Lennie’s physical capabilities makes the two of them a good example of the body/mind dichotomy.