In my estimation, if one is an authority on a subject, it means they know everything about it. Maybe I’m wrong in that, but that is the how that statement grabs me. Therefore, is anyone, even experts, an authority on any one particular subject? There is always something to learn no matter how well we know it. Why is that? It’s because things change, and there is something else about it hidden around the corner somewhere.
WRITE TIME AND AGAIN 