"That I am not Edward Rochester's bride is the least part of my woe," I alleged: "that I have wakened out of most glorious dreams, and found them all void and vain, is a horror I could bear and master; but that I must leave him decidedly, instantly, entirely, is intolerable. I cannot do it."
Chapter 27 · Jane Eyre
Context
Jane, alone in her room after learning Rochester is already married, wrestles with the internal voice commanding her to leave Thornfield immediately.
Analysis
Jane arranges her grief into a tricolon of escalating unbearability, using parallel 'that…' clauses. She concedes she could endure the first two losses—her title as Rochester's bride, the collapse of her dreams—but the third demand, 'that I must leave him decidedly, instantly, entirely,' piles up three adverbs that hammer home the finality she cannot accept. The rhythm itself enacts her mounting resistance: each repetition tightens the noose of duty until she breaks and declares, 'I cannot do it.'
Essay Tip
Support a thesis that Brontë uses syntax to dramatize the inner conflict between what Jane knows she must do and what she feels capable of doing—the structure of the sentence mirrors the process of her will collapsing under emotional weight.