I would assume GP is talking about the fallibility of human memory, or perhaps about the meanings of words/phrases/aphorisms that drift with time. C.S. Lewis ta

I would assume GP is talking about the fallibility of human memory, or perhaps about the meanings of words/phrases/aphorisms that drift with time. C.S. Lewis talks about the meaning of the word "gentleman" in one of his books; at first the word just meant "land owner" and that was it. Then it gained social significance and began to be associated with certain kinds of behavior. And now, in the modern register, its meaning is so dilute that it can be anything from "my grandson was well behaved today" or "what an asshole" depending on its use context. Dunno. GP?