In this excerpt <em>darkness </em>contains personification because it is described as cruel.
Personification is a standout among the most utilized literary devices. It alludes to the act of joining human qualities and attributes with lifeless things, wonders and animals.
The two associated ideas that the author (Carson McCullers) relate from story "Loneliness" is the creation of individual identity and the need of people to belong in something. The story actually talks about how Americans do not like to be lonely or isolated.