It’s surprising how inflexible people can be with their opinions! They may be the smartest people you know, they may be leagues ahead in many ways, but they can shock you with the nonsense they spout when their opinions are challenged.
Even if you’re infinitely confident you’re right, keep your thoughts open to contention. You may know a lot, but there will be at least a minimal chance that you may not have factored in everything.
Be smart about your opinions. Close mindedness did not help men discover fire. Open up!