In a world so full of boundaries, how do lines we use to segregate and define really come into play?

There are, and will always be, divisions. The division created by shared pasts, and shared memories. Who and how we see ourselves and how we define our communities is not just in shared languages, histories, arts and cultures, but also in the shared omitting of ideas, thoughts, beliefs, and sometimes truth.

Which is a more honest representation of a value; what one chooses to exclude or include?