The epiphany in this passage that Todd has is the culmination of all his growth so far. Todd had gotten in the habit of using Noise to learn about the people around him, and he thought that perhaps becoming an adult meant learning how to tame his own Noise, hiding unwanted thoughts. But Todd learns that instead of trying to control Noise, he can also ignore it altogether, and that learning the empathy to understand another person’s true thoughts is a different skill altogether from Noise.