Her thoughts being still chiefly fixed on what she had with such causeless terror felt and done, nothing could shortly be clearer than that it had been all a voluntary, self-created delusion…Among the Alps and Pyrenees, perhaps, there were no mixed characters…[but] among the English, she believed, in their hearts and habits, there was a general though unequal mixture of good and bad.
This passage is from Volume II, Chapter X. It shows that Catherine has learned something from her wild speculation about General Tilney and her subsequent scolding by Henry for thinking such a terrible thing. "The Alps and the Pyrenees" refers to the settings of the Gothic novels that Catherine reads. Here Catherine recognizes the fact that in those novels, people are either all good or all bad, and a bad-tempered widower is an obvious murder suspect. But in the real world of England, Catherine realizes, people can be both good and bad. The real world Catherine refers to is actually a fictional world created by Austen, who suggests that even in fiction, characters need not be purely good or purely evil. In this passage, Austen makes it clear that her project is to create fiction that accurately reflects the world as it is.

This passage is from Volume II, Chapter X. It shows that Catherine has learned something from her wild speculation about General Tilney and her subsequent scolding by Henry for thinking such a terrible thing. "The Alps and the Pyrenees" refers to the settings of the Gothic novels that Catherine reads. Here Catherine recognizes the fact that in those novels, people are either all good or all bad, and a bad-tempered widower is an obvious murder suspect. But in the real world of England, Catherine realizes, people can be both good and bad. The real world Catherine refers to is actually a fictional world created by Austen, who suggests that even in fiction, characters need not be purely good or purely evil. In this passage, Austen makes it clear that her project is to create fiction that accurately reflects the world as it is.