The only literary concept I see there is 'interiority'. All the rest are perfectly ordinary terms that you could look up in a dictionary. I think 'interiority'

The only literary concept I see there is 'interiority'. All the rest are perfectly ordinary terms that you could look up in a dictionary. I think 'interiority' here refers to an interest in the interior psychological deliberations of characters (which you won't find much of in Tolkein).