Another quote could be 'They don't bother not talking out loud about their hate secrets when I'm nearby, cause they think I'm deaf and dumb.' This reveals how others in the novel perceive him and how he is privy to the 'hate secrets' of others because they underestimate his awareness due to his outward appearance of being unresponsive.
Chief Bromden might say something like 'I been silent so long it hurts.' This quote reflects his long - held silence and the pain associated with it, perhaps indicating his repressed state of mind in the story. He has been quiet for a long time, bottling up his thoughts and feelings, and this statement gives a glimpse into his inner turmoil.