I have often been confused over this conversation between Lizzy and her aunt, after they have heard the Pemberley housekeeper praising Darcy's fine character.

"This fine account of him," whispered her aunt as they walked, "is not quite consistent with his behaviour to our poor friend."
"Perhaps we might be deceived."
"That is not very likely; our authority was too good."

I cannot make up my mind whether Lizzy means they were deceived by the housekeeper, or deceived by Wickham. I am favouring that she means deceived by Wickham, as she knows by this stage that he has deceived people, though her aunt is unaware of this. Also, her aunt says our authority WAS too good - I would guess if she meant the housekeeper she would say our authority IS too good i.e. present tense. I cannot recall what she says in P&P2 - i.e, 'is' or 'was'.