explain

In this world, there are some walls of substance and thought, that are built of such mighty and impenetrable granite, that all the tools of diamond edge or sequential and irrefutable logic ever conceived by mortal man, can make not a perceivable, even if microscopic, scratch in the seamless infinite expanse of it's crag-ed aged surface. In other words: As GOD is my witness, I will never again attempt to explain to my elderly parents what "wide screen" TV means.