(Original Review, 2002-06-20)
Many very good books are not difficult to read--at least for the people who read them and have read them. But books can become difficult when difference of culture, or viewpoint, or language, or elapsed time intervene. Dickens is more difficult now than 150 years ago, and part of the reward of reading Dickens is the learning of how British society has changed. The difficulty of reading Virgil might include learning some Latin; the difficulty of reading Dante might involve at least a parallel text edition.
If you're into stuff like this, you can read the full review.