When a dark and beautiful "Arabian" woman named Safie arrives at the cottage, the family's mood, and Felix's in particular, brightens. Safie does not speak the family's language, and Felix teaches her from a history book. As she learns, so does the monster, which is disgusted that a race as noble as mankind is also capable of such evil.
The notion that a "noble and godlike" species like man can also be "evil" disgusts the monster and leaves it with a feeling of loathing. The gaining of language and the knowledge it offers can be seen as a loss of innocence.
As he learns about society and humans, the monster realizes that it has no society of its own. It is a monster, doomed to be always without family or people. It wishes it had never gotten this knowledge about society, which makes it so miserable.