Read "Journey to the Centre of the Earth" by Jules Verne online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
Man's constitution is so peculiar that his health is purely a negative matter. No sooner is the rage of hunger appeased than it becomes difficult to comprehend the meaning of starvation. It is only when you suffer that you really understand.
As to anyone who has not endured privation having any notion of the matter, it is simply absurd.