Most people aren't open minded.
Nowadays everyone thinks he's some kind of a genius.
It's very hard to change someones believes just with words.
To really prove them wrong, you have to shut your mouth and let your actions speak.
Once they see the truth with their own eyes they will reconsider their opinion. Well, at least if they aren't some idiots.
Never try to convince someone of anything. If you do, you just show that you care about other people opinions and you lower yourself to their level.
What do we learn from this?