I do assure you that I am not one of those young ladies (if such young ladies there are) who are so daring as to risk their happiness on the chance of being asked a second time. I am perfectly serious in my refusal. You could not make me happy, and I am convinced that I am the last woman in the world who could make you so.

– Jane Austen

Pride and Prejudice, Chapter 19. Elizabeth has a hard time getting Mr. Collins to accept that she doesn’t want to marry him, as he believes it is usual for young ladies to reject a proposal the first time, so it has to be repeated. But she makes clear that she is perfectly serious about her refusal. She points out that she is not the kind of woman to first say "no" and then say "yes" to a proposal of marriage. Her statement turns out to be ironic, because that’s exactly what she will do with Darcy.