There is a lot that I don't know. Some of those things, I know that I don't know. Others, I don't even know that I don't know. There are even things that I think that I know where later I find out that I didn't know anything at all.
All of this doesn't discourage me. On the contrary, it inspires me. There is so much in the world to learn, and I get to spend my life in a quest to start to learn the things that I don't know yet. It's exciting when a new nugget of truth is uncovered that opens a door to all sorts of new questions and shines light on more areas to learn. I never want to be an expert. I never want to believe that I have "arrived." I hope that you don't either.