What you are running up against is sort of the best thing about books.

Books remind us that we don't really know anything. They keep us humble and reflective on just how big everything is and how we can never know it all. Every single book is going to have something in it you didn't know before OR didn't think of that way before. They are as individual as people.

Every person you meet knows something you don't know or has a perspective you don't have. That's the real contribution of literature is that sense of place in the universe and wonder at all there really is to know.