The things you know are based on your experience, study, observation, and interaction with others. They are are unique to you. Since they are not the same as anyone else, your opinion about something can be vastly different from another's. That's where debate, discussion and argumentation can play an important role in expanding point of view.

This episode is also available as a blog post: https://kocharhook.wordpress.com/2021/02/17/the-beauty-of-argument/