How we cite our quotes: Citations follow this format: (Chapter.Paragraph)
Quote #7
"I mean to be too rich to lament or to feel anything of the sort. A large income is the best recipe for happiness I ever heard of. [...]."
"You intend to be very rich," said Edmund, with a look which, to Fanny's eye, had a great deal of serious meaning.
"To be sure. Do not you? Do not we all?" (22.36-8).
Edmund's look here is very telling and hints that he is troubled by Mary's attitude about money buying happiness. If Mary wants to marry for money then it doesn't bode well for Edmund's chances since he won't ever be extremely rich.
Quote #8
In thus sending her away, Sir Thomas perhaps might not be thinking merely of her health. It might occur to him that Mr. Crawford had been sitting by her long enough, or he might mean to recommend her as a wife by showing her persuadableness (28.34).
Since marriage is a "maneuvering business," both men and women often tried to "market" themselves to potential spouses by showing off certain qualities. Since women and wives in this period were supposed to be obedient, Sir Thomas is basically marketing Fanny as a good potential wife by showing how easy she is to boss around.
Quote #9
Henry Crawford had too much sense not to feel the worth of a good principles in a wife, though he was to little accustomed to serious reflection to know them by their proper name (30.16).
Henry may like flirting and having a good time, but he's smart enough to want to marry someone with good principles. This reveals an interesting facet of Henry's often un-serious character, and shows that he does have some "principles."