What you don't know is bigger than you. You can only defend what you know others are willing to know. Some are not willing to know, when you know certain things.
You would be noticed by people, but it is impossible to know all things
Everybody have their different destinies in life. So, when you know where you are fit into and work towards that area.
Develop yourself to know more than your equals in your area of specialty so you can standout tall amongst the crowd
You are correct about what I know been bigger than I feel