What are the most prominent examples of the theme of "pride" being expressed in Pride and Prejudice?

The most prominent example of "pride" in Jane Austen's
novel, Pride and Prejudice are Elizabeth's behavior with Darcy, and
with her family.

Although Darcy acts foolishly towards
Elizabeth and her family at the beginning of the novel, looking down on them because of
their "social inferiority" and country manners, he is a man who is able to revisit
decisions he makes and change his mind if he believes he has been wrong in his judgment.
However, Elizabeth, who believes herself perhaps ethically superior to Darcy is unable
to recognize that perhaps she doesn't know him as well as she thinks; nor does she
revisit her feelings towards him until the proof is right there in front of her,
irrefutable—that he is not the devil she imagines him to be. It seems that Darcy is able
to change his preconceptions based on what he witnesses with regard
to Elizabeth and her family, despite what others may say. Elizabeth
cannot see the good in Darcy, perhaps letting her overblown sense of pride with Darcy
blind her to what is right before her eyes.

However,
Elizabeth's pride is also a positive thing in how she protects her family and herself.
When she overhears Darcy making a rude comment about why he won't dance with Elizabeth,
she refuses to let the comment make her feel small. She takes pride in who she is, and
regardless of social standing, knows that she has value that has nothing to do with the
opinions of others.

Though her family
sometimes embarrasses her with their "rough" country ways, she still has a sense of
pride in them. They are good people; they love and support each other; and, they are
generally patient with Elizabeth's feistiness.

In the
novel, there are two sides to pride. On one hand, it interferes with the way Elizabeth
sees Darcy, and her refusal to give him the benefit of the
doubt.

By
trusting entirely to her own observations (pride)..., Elizabeth threatens her future
happiness with Fitzwilliam
Darcy.

However, in defending
her family from the nasty behavior of people like the Bingley women, Elizabeth
demonstrates a sense of pride in who she is and the family from which she
comes.