What human qualities and ideals are revealed through this story?

The lawyer writes one last letter when he is about to escape, explaining his motivation. He believes that he has grown wiser than everyone, and he hates them all, their motivations, reason etc. He believes that they have everything backwards and he can't understand them. So ironically, though we might expect someone released from solitary confinement to be eager for interaction with other people, the lawyer's experience in solitude actually made him desire to stay away from other, baser people.