John MacArthur’s latest book, unimaginatively titled The Book on Leadership, has one of the finest-looking covers I have ever seen. With its leather-looking cover, rough-cut pages, gold lettering and marbled inside pages, it looks like a wonderful, valuable, antique book. Truth be told, I probably would not have purchased it were it not for that cover. I am not so shallow that I would purchase it based soley on the cover, but a great cover and an author I respect …