In Haruki Murakami's novel "1Q84," the quote highlights the dangers of overconfidence and the ease with which people can be misled when they believe they are infallible. This suggests that an unwavering conviction in one's beliefs can blind individuals to reality, making them susceptible to manipulation or deception.

The idea emphasizes the importance of humility and open-mindedness in one's perspective. It serves as a reminder that questioning our own beliefs and assumptions is crucial to avoid being misled, as certainty can create a false sense of security that leaves one vulnerable to being fooled.