I saw his solemn eye melt with sudden fire, and flicker with resistless emotion. Flushed and kindled thus, he looked nearly as beautiful for a man as she for a woman. His chest heaved once, as if his large heart, weary of despotic constriction, had expanded, despite the will, and made a vigorous bound for the attainment of liberty. But he curbed it, I think, as a resolute rider would curb a rearing steed.
Chapter 31 · Jane Eyre
Context
Jane watches St. John's face as Rosamond playfully tries to persuade him to visit her father. Despite his rigidly controlled exterior, Jane perceives a flash of intense emotion breaking through before he suppresses it.
Analysis
The metaphor of St. John's heart as a 'rearing steed' under a 'resolute rider' makes his self-control a form of violence against his own feelings—the rider and the horse are the same person, locked in combat. The verb 'curbed' works literally (pulling back reins) and figuratively (restraining impulse), while 'despotic constriction' frames his religious discipline as tyranny against the self. Jane's observation that he 'looked nearly as beautiful' in that unguarded moment codes passion as beauty and repression as its opposite, quietly criticizing the life he's chosen.
Essay Tip
Use this to argue that Brontë presents St. John's self-denial not as admirable virtue but as self-inflicted cruelty—the novel values emotional honesty (even when painful) over rigid control, and Jane's narration makes that judgment clear through metaphor.