We all live in boxes... invisible boxes... the borders exist in our minds of what we believe we can do and what we believe we can't. Some of this is from experience, our own expectations but most importantly what we've been taught. Much like the story of Five Monkeys.
Knowledge and awareness is potential power. Knowledge in action is power. I would encourage anyone to make it a habit of stepping outside that box regularly. They may just find out they're much more than they thought!