You will come some day to a craggy pass in the channel, where the whole of life's stream will be broken up into whirl and tumult, foam and noise: either you will be dashed to atoms on crag points, or lifted up and borne on by some master-wave into a calmer current—as I am now.
Chapter 15 · Edward Rochester
Context
Still addressing Jane, Rochester extends his water metaphor to predict that she will one day face turbulent emotional upheaval, then claims he himself has already passed through such turmoil and reached calm.
Analysis
The extended metaphor structures life as a river moving toward catastrophe—'craggy pass,' 'whirl and tumult'—and offers only two outcomes: destruction or rescue by a 'master-wave.' The phrase 'master-wave' quietly introduces the language of mastery and submission that will define Rochester's courtship of Jane; he imagines love as a force that either annihilates you or carries you into submission.
Essay Tip
Support a thesis that Rochester consistently frames love in terms of dominance and surrender—even his reassurance to Jane encodes the assumption that she will need to be 'borne' by something stronger than herself, preparing us for his later attempt to control her through marriage.