My dear,” said Mr. Bennet, “if a sock puppet with a trust fund and a Harvard medical degree moved here, you’d think he was meant to marry one of our girls.
-- Mr. Bennet (chapter 1)

Importance: Mr. Bennet reproaches his wife after she reveals that she wants Chip Bingley to marry one of her daughters. The quote reflects the fact that Mrs. Bennet sees marriage as a financial arrangement, rather than an affair of the heart.

Everything in moderation.
-- Liz and Darcy (8 and 33)

Importance: Although Liz and Darcy initially dislike each other, the author foreshadows their later relationship by having them say similar things and express similar opinions. In this case, both express the same opinion about dieting on separate occasions.

If Mary has a friend who she doesn’t think she can bring to dinner, that’d be rather a shame,” Mr. Bennet said. “Her significant other deserves to suffer as much as the rest of us.
-- Mr. Bennet (chapter 18)

Importance: Mr...