Quote 1
"Not so hasty, if you please. I have by no means done. To all the objections I have already urged, I have still another to add. I am no stranger to the particulars of your youngest sister's infamous elopement. I know it all; that the young man's marrying her was a patched-up business, at the expence of your father and uncles. And is such a girl to be my nephew's sister? Is her husband, is the son of his late father's steward, to be his brother? Heaven and earth! —of what are you thinking? Are the shades of Pemberley to be thus polluted?" (56.63)
To be fair, we sympathize with not wanting to be related to Wickham—but not because he's basically a servant's son; because he's a deceitful, gambling seducer. Either way, Lady Catherine's response is hilariously over the top: "Are the shades of Pemberley to be thus polluted," as though Elizabeth is actually going to make the estate dirty.
Quote 2
"Miss Bennet I am shocked and astonished. I expected to find a more reasonable young woman. But do not deceive yourself into a belief that I will ever recede. I shall not go away till you have given me the assurance I require." (56.56)
And by "reasonable young woman," Lady Catherine means "someone who, like everyone else, will do exactly what I say." Lady Catherine is ridiculous, of course, but these moments really show us how awesome Elizabeth is.
Quote 3
"Not so hasty, if you please. I have by no means done. To all the objections I have already urged, I have still another to add. I am no stranger to the particulars of your youngest sister's infamous elopement. I know it all; that the young man's marrying her was a patched-up business, at the expence of your father and uncles. And is such a girl to be my nephew's sister? Is her husband, is the son of his late father's steward, to be his brother? Heaven and earth! —of what are you thinking? Are the shades of Pemberley to be thus polluted?" (56.63)
We forgive you for getting a little confused with all these uncles and nephews. We're not saying family doesn't matter, but Lady Catherine really seems to be taking it a step too far. It's like she thinks she's going to be polluted by being very, very, very distantly related to Wickham.
Quote 4
[Elizabeth:] "Indeed, you are mistaken, Madam. I have not been at all able to account for the honour of seeing you here."
"Miss Bennet," replied her ladyship, in an angry tone, "you ought to know, that I am not to be trifled with. But however insincere you may choose to be, you shall not find me so. My character has ever been celebrated for its sincerity and frankness, and in a cause of such moment as this, I shall certainly not depart from it." (56.25-26)
We sort of have to love Lady Catherine the bulldozer. She's not up to any tricks here, and is totally blunt about her anger that Elizabeth might be engaged to Darcy. Most characters would dance around the topics with a bunch of passive-aggressive insinuations. Apparently, rank does come with some privileges.
Quote 5
"You have no regard, then, for the honour and credit of my nephew! Unfeeling, selfish girl! Do you not consider that a connection with you must disgrace him in the eyes of everybody?[…] You are then resolved to have him?"
"I have said no such thing. I am only resolved to act in that manner, which will, in my own opinion, constitute my happiness, without reference to you, or to any person so wholly unconnected with me. […] Neither duty, nor honour, nor gratitude," replied Elizabeth, "have any possible claim on me, in the present instance. No principle of either would be violated by my marriage with Mr. Darcy. And with regard to the resentment of his family, or the indignation of the world, if the former were excited by his marrying me, it would not give me one moment's concern—and the world in general would have too much sense to join in the scorn." (56.64-69)
Here, in the totally ridiculous person of Lady de Bourgh, we actually get one of the main philosophical questions of the novel. How much should someone bow to the demands of the surrounding society? How much emphasis should be put on the happiness of the individual? Does the novel resolve this question? Or does the ending kind of sidestep this issue after raising it here and there?