Clarity: We're Least Clear When We Think We're Most Clear

When we've thought about something a long time - and had experiences that ground it in our understanding - we feel that we're clear about that something. Very clear. So we feel that when we express our understanding, everyone will understand what we mean. But we're often misunderstood. The larger context of our long pondering and experience is missing. We have "a book" in our heads, and the listener got only "the email."