The Scottish Enlightenment embarked on nothing less than a massive reordering of human knowledge. It sought to transform every branch of learning—literature and the arts; the social sciences; biology, chemistry, geology, and the other physical and natural sciences—into a series of organized disciplines that could be taught and passed on to posterity.
Any sign of moral didacticism ruins art, if art is understood as its own autonomous social system. Art, in this sense, cannot be the servant of religion, education, philosophy, science any other kind of communication. These other systems can only use art parasitically.
The novel as a genre, particularly as written by Turgenev, is all about the study of individuals–what makes people different, not what makes them similar.