Pablo Neruda "Is 4 always 4 for everyone?"

I kinda consider this a question directed to all of those that think they know it all. He is simply stating, you DON'T know everything, no one does. When was someone given the right to dictate their knowledge upon others? When was that "knowledge" considered to be right? I also think that he talks about everyones meaning towards.. anything. What does anyone and everyone really know about anything? There are ways to help us become more knowing of the meaning of anything, we just need to stay more open minded and quit assuming.