Well, there are too many, but I really liked these:

"I am come, young ladies, in a very moralizing strain, to observe that our pleasures in this world are always to be paid for, and that we often purchase them at a great disadvantage, giving ready-monied actual happiness for a draft on the future, that may not be honoured."

"If Wednesday should ever come! It did come, and exactly when it might be reasonably looked for."