What is the conclusion in the end of Jane Eyre?

In the novel's conclusion, Jane and Rochester are married, and she writes of her marriage to her three cousins. Jane also takes Adèle home to Ferndean and enrolls her in a more appropriate school, where she keeps a close eye on her. As Adèle matures, she and Jane become great companions. After ten years of marriage, Jane reflects that her married life has been the greatest blessing of her life. Two years after their marriage Rochester recovers partial sight in one eye, so he is able to see his first-born son. Diana and Mary are married also and happy in their unions. St. John is steady and firm on the missionary path he has set for himself. From the news in his last letter, however, Jane feels St. John will not live on earth much longer. Jane is happy St. John will soon be with his Maker in eternal paradise.

The light, happy tone of this final chapter differs greatly from the dark tone of the rest of the book. It is here that Bronte departs from her Gothic timbre. Jane has finally found happiness in marriage with Mr. Rochester. Those she knows and loves are also happy, making her joy complete. Through all that Jane has suffered in her life and all that she has lost, these losses have finally been repaid. Note the use of biblical phrases in this last chapter, specifically that the final lines of the novel echo the final lines of the book of Revelation in New Testament.