The House with the Mezzanine by Anton Chekhov

At first through the darkness there appeared only a blue circle, the port-hole, then Goussiev began slowly to distinguish the man in the next hammock, Pavel Ivanich. He was sleeping in a sitting position, for if he lay down he could not breathe. His face was grey; his nose long and sharp, and his eyes were huge, because he was so thin; his temples were sunk, his beard scanty, the hair on his head long.... By his face it was impossible to tell his class: gentleman, merchant, or peasant; judging by his appearance and long hair he looked almost like a recluse, a lay- brother, but when he spoke--he was not at all like a monk. He was losing strength through his cough and his illness and the suffocating heat, and he breathed heavily and was always moving his dry lips. Noticing that Goussiev was looking at him, he turned toward him and said: "I'm beginning to understand.... Yes.... Now I understand."

-"What do you understand, Pavel Ivanich?"