Ten Years Later: The Man in The Iron Mask by Alexandre Dumas Chapter 56 Page 7

He examined, therefore, from the depths of his hiding-place, the nature of that mysterious malady which bent and aged more mortally every day a man but lately so full of life and a desire to live. He remarked upon the cheeks of Athos the hectic hue of fever, which feeds upon itself; slow fever, pitiless, born in a fold of the heart, sheltering itself behind that rampart, growing from the suffering it engenders, at once cause and effect of a perilous situation. The comte spoke to nobody; he did not even talk to himself. His thought feared noise; it approached to that degree of over-excitement which borders upon ecstasy. Man thus absorbed, though he does not yet belong to God, already appertains no longer to the earth.

The doctor remained for several hours studying this painful struggle of the will against superior power;