Clarissa, Or the History of a Young Lady (1747-8)
by Samuel Richardson
The difficulty of Richardson’s masterpiece lies almost exclusively in its length: the outsized Penguin Classics edition (9×5.5×3) is 1,500 pages and weights nearly three pounds.
I’m not sure it’s the longest novel in English; Richardson’s own Sir Charles Grandison might be longer, and surely the likes of Pynchon, Wallace, and Bolaño have overtaken Clarissa by now—but she is certainly among the longest. Other possible sources of difficulty: the eighteenth-century diction and syntax of Richardson’s masterpiece may seem a little strange or prim at first, as may the social mores of eighteenth-century England, and some readers find the plot insufficient to the length of the book (“if you were to read Richardson for the story,” Samuel Johnson noted, “your impatience would be so much fretted that you would hang yourself.”) Many readers, however, are ultimately drawn in by Richardson’s hero and heroine and the incredible psychological depth with which he draws them (Johnson again: “the first book in the world for the knowledge it displays of the human heart”). The nature of the relationship between the beautiful, virtuous, otherworldly Clarissa Harlowe and her lover/tormenter, the aristocratic libertine Robert Lovelace is entrancing. For emotional and psychological complexity, you will not find a more impressive novel in English.
Source: themillions.com