Anne Elliot's "duty" guided her through life's trials.
Doing what is right, for Jane Austen's heroines, requires a great deal of "exertion"!
What "good principles" was Darcy given, and how could he follow them in "pride and conceit"?
In Jane Austen, "serious" has a deeper meaning than we use for it today.
"Candour" meant something very different to Jane Austen than it does to us today. How does Jane Bennet teach us candor?