Man is a creature who gets used to everything, and that, I think, is the best definition of him.
Development of the third major theme: How man lives. I guess this is one of the major overarching themes of all of Dostoyevsky's works - not how man survives, but how and for what he lives. Calling it a "living dead house" is intentional.
I am once again appreciating his contrast wth the Underground Man. The Underground Man defined man as a being that walks around on two legs, being ungrateful.
