Although I only read thirty or so pages it is quite as cogent and lucid as its predecessors, and contains a vast wealth of learning elegantly understood and presented. I learned from my reading, or came to realise things which are actually very obvious, but rarely stressed. In doing so the Pope definitely enriches his readers' understanding. A book to read, and one to return to, and one to help one understand and explain the Faith.
In other words, just what one would expest from the author.