The story's irony hinges on the concept that life is never entirely perfect. It was not the fire itself that caused Rochester's disabilities but rather the circumstances surrounding the individuals involved in that fire, which led to him losing his vision and a hand. However, this turned out to be a beneficial experience as it ultimately guided him back to Jane.
Upon reviewing the excerpt from "How Should One Read a Book?" it is apparent that most individuals approach books with skewed perceptions, requesting fiction to reflect reality, wishing poetry to be untrue, desiring biographies to be flattering, and hoping historical texts validate their biases. A commendable start would be to eliminate such preconceived ideas when reading. Therefore, readers can deduce that the passage originates from an essay.