I was going back to Thornfield: but how long was I to stay there? Not long; of that I was sure.
Chapter 22 · Narrator
Context
Jane is traveling back to Thornfield after her month-long stay at Gateshead following her aunt's death. She has learned from Mrs. Fairfax that Mr. Rochester is expected to return soon, likely to prepare for his wedding to Miss Ingram.
Analysis
Jane's abrupt self-interruption—'Not long; of that I was sure'—enacts her habit of cutting off her own hope before it can fully form. The certainty in 'I was sure' contrasts sharply with the question that precedes it, revealing how Jane preemptively shuts down any fantasy of permanence at Thornfield to protect herself from disappointment. This split between longing and resigned acceptance runs throughout her internal voice in the novel.
Essay Tip
Use this to argue that Jane's narration often performs emotional self-discipline—she doesn't just tell us she renounces hope; the syntax shows her doing it in real time, which makes her suffering more immediate to the reader than simple retrospective summary would.