+1 - Dostoyevsky is a must have. There are many fictional books that tell so much truth about humanity, but I would recommend Karel Capek's novels as those are

+1 - Dostoyevsky is a must have. There are many fictional books that tell so much truth about humanity, but I would recommend Karel Capek's novels as those aren't very popular nowadays. Particuraly: The "Absolute at Large" and "War with the Newts".