This is actually so much deeper than some people might think
Atop the Empire State Building on Opening Day c.1931
Okay, bare with me on this one:
Basically, here it says that if I choose to read minds, the one I read the mind of can read mine as well. But since I’m already reading his mind, what I hear in my mind is what he has in mind, so if he reads it he’ll just be reading his own mind and it’s gonna bounce back and forth and just become this long giant echo until our brains explode.