St. John and Jane

St John is talking about this missionary trip to India he is going to in the near future, and why it is important that he learns their language. He suggests that Jane should quit her German classes and start learning this Hindu language with him. After a long discussion with Jane about the trip, he invites her to come with him as a missionary. What Jane didn't expect was St. John's proposal to come to the missionary trip as his wife. St. John thinks strongly that Jane should marry him because it was the best for his christian way of life. Jane, on the other hand, replies that she wishes to go on the trip but not as his wife. She is not in love with St. John and that is why she strongly disagrees with them getting married. One of the Rivers sisters also tells Jane that she shouldn't marry her brother, that he would use her. In my opinion, Jane is still thinking about Rochester and that is why she does not accept a new idea into her life, however, I think she still wouldn't marry St. John because they do not have the love needed for marriage.