For years I've thought that was Twain's.

Well, Twain used it frequently, Bruce - God knows he had REASON to, in the bowels of the "Gilded Age".

Which bowels we have pretty much re-created in the present day.

Which brings us to Santayana- Those that don't learn from history & all that.

Or to Twain's concise summing up: "The God Damned Human Race."