[Jensson]

A critical component to learning is letting other people see your thoughts and ideas and get them to criticise them. This part is much much easier to do if you aren't humble about it, you only need a tiny bit of humility to read and understand others ideas, anything above that will just hurt your ability to learn.

The most common thing people do is the opposite of the above. They are humble with their own ideas and are scared to show them to people, while they are confident in shooting down others ideas so they don't learn that well from listening. Even people who see themselves as humble are usually following this worst of the worst strategy.