I hate to disturb anyone's good day, but a really humble person may be having more trouble with grandiosity than someone who thinks they're pretty hot stuff.
It's more about making other people think that you're confident as opposed to actually just being confident, which is why cocky people tend to talk a lot.
Robert Moore, too, argues for the need of people of understanding who know how to control our grandiosity and reconnect us to the fabric of the universe.