Chapter 31:

"Catherine would make a sad, heedless young housekeeper, to be sure," was her mother's foreboding remark; but quick was the consolation of there being nothing like practice."

I like this one too:
"The anxiety which in this state of their attachment must be the portion of Henry and Catherine, and of all who loved either, as to its final event, can hardly extend, I fear, to the bosom of my readers, who will see in the tell-tale compression of the pages before them, that we are all hastening together to perfect felicity."

and this:
(About Eleanor's fiance)"Concerning the one in question, therefore, I have only to add (aware that the rules of composition forbid the introduction of a character not connected with my fable) that this was the very gentleman whose negligent servant left behind him that collection of washing-bills...by which my heroine was involved in one of her most alarming adventures."

The lines you quote, MandyN, also remind me of my thoughts about mothers. I could definitely see myself in the passage at the beginning of Chapter 30, in which Mrs. Morland reacts to her daughter's uncharacteristic sadness: She allows it to pass for a few days, but finally uses some sarcasm (what mother hasn't!!) in her "gentle reproof" to Catherine - "I am afraid you are growing quite a fine lady. I do not know when poor Richard's cravats would be done if he had no friend but you...you have had a long run of amusement, and now you must try to be useful."

She assumes that what is bothering Catherine continues to be General Tilney (which is what she - the mother - knows about, but there is so much she doesn't know!!). Mothers often run on about things, taking the high moral ground, when sometimes, they just don't get it!!! ;-}