Nobody listens any more. I can't talk to the walls because they're yelling at me. I can't talk to my wife; she listens to the walls. I just want someone to hear what I have to say. And maybe if I talk long enough, it'll make sense. And I want you to teach me to understand what I read.
This quote helps explain that people have somewhat regulated the sharing of opinions and morals in our society by stopping listening to others when they share them.
Another parallel that came up from the world created in Fahrenheit 451 was the use of fire to end something that the society was ultimately unhappy with. Books were burned with fire and completely destroyed in the acts that the ‘firemen’ would perform.