You would be surprised at the many varieties of ways there are to think, of how chaotic a world that world truly is, and how so many variables had to come together for you to get where you are, and how delicate a balance that truly is.
It's one thing to be humble, it's entirely another thing to humble yourself so much you manage to convince yourself you are actually an idiot.
You learned how to learn by having the privilege of having the free time to teach yourself how to learn, how to observe others in a learning environment, and how to get an idea of how to position yourself in a huge organization where you can contribute your specific skill set to a larger whole, and you continue to collectively add to human knowledge without adding a static layer of chaos and confusion.
Please, tell me where I can get a tenured professorship without a PhD by hustling. I'd love to know.