“Jane Fairfax has feeling,” said Mr. Knightley – “I do not accuse her of want of feeling. Her sensibilities, I suspect, are strong – and her temper excellent in its power of forbearance, patience, self-control; but it wants openness. She is reserved, more reserved, I think, than she used to be – And I love an open temper.”
– Jane Austen
Emma, Chapter 33. When Emma teases Mr. Knightley about the possibility of marriage to Jane Fairfax, he makes it clear that he is not interested. He points out that he prefers women who are open tempered and not reserved. As Emma seems to fit the bill a lot more than Jane, this may be seen as Austen foreshadowing her and Knightley’s eventual marriage.