Learn, understand, then decide whether you accept or reject.
This is an analysis of a select few classic literary works and discussing the themes within it to a contemporary audience, with a consideration of the societal elements present when it was written.
It could have been doubled in length and not have covered everything available to analyse. It is an excellent, ambitious attempt in a subject that is massive in scope.
Having listened to both Naxos sets (Anton Lesser), Blackstone (Ralph Cosham) and (Nadia May) for some years, I have to say that Griffin really holds the listener. You can soon skip the biography if you wish. You can also enjoy and learn from 'Paradise Regained' as this, too, is really an added bonus in this set!
If you are troubled with understanding at first, read Lanzana's novel or his plain English version. C. S. Lewis has a famous 'Preface'. Nicolson's 'Reader's Guide to John Milton' is also a great way to start. Blarmire's 'Milton's Creation' is a superb commentary.
Keep listening to Milton, especially this set, and you'll find a life-long friend - by far the best writer of all!