In Jane Austen’s Mansfield Park, Tom Bertram — the feckless, selfish, wayward elder son of Sir Thomas Bertram — becomes very ill. It starts with a fever, but even after the fever diminishes he lingers on in a bad state. “They were apprehensive for his lungs.” (I was teaching the book yesterday and asked my students, “What does that sound like?”)

Near the end of the book we learn that Tom’s recovery is a source of reassurance to his father in difficult times:

There was comfort also in Tom, who gradually regained his health, without regaining the thoughtlessness and selfishness of his previous habits. He was the better for ever for his illness. He had suffered, and he had learned to think: two advantages that he had never known before; and the self-reproach arising from [his earlier bad behavior] made an impression on his mind which, at the age of six-and-twenty, with no want of sense or good companions, was durable in its happy effects. He became what he ought to be: useful to his father, steady and quiet, and not living merely for himself.