In Pride and Prejudice, communication could pretty much be said to be the very thing for which everyone is striving. The characters are faced with the challenge of expressing their feelings to one another, of correcting each other's mistakes, and of giving each other context for the decisions and actions they take. Frequently, this means stepping outside the boundaries set up by good manners and acceptable behavior. Actually, good manners and the rules of acceptable behavior tend to be obstacles that get in the way of meaningful discussion. However, breaking these rules carries its own dangers, since the socially tone-deaf tend to become outcasts.
A lot of the novel's humor comes from dialog, and the way characters are totally unable to understand each other or to make themselves understood.
Much of a character's power comes from the ability to shut others up when necessary.