When there is only one voice in your world, that voice will be amplified infinitely. In the end, you will think that it is the only truth in the universe. And those who hold different opinions are no longer seen as people with different views, but as: "fools or bad people." Our psychological mechanism is naturally equipped with a "confirmation bias," where we instinctively like to find evidence that supports our own views and automatically ignore information that contradicts us. When you only hear voices of agreement, you may mistakenly believe that this is the full picture of the world. This is "cognitive poison," which cripples our ability to access diverse perspectives and truths.