The memories. They never let him go, not even for a half hour. They always had to rush back in, bringing all the horror.
-- Narrator (Chapter 2 paragraph p. 13)

Importance: Here, the narrator explains that Mark is haunted in his sleep by his dreams, which are memories of the horrors and terrors of the past year of fighting to survive. Mark cannot escape his dreams, just as he cannot escape the past. The past constantly plays at Mark's mind, driving him on in the search of normalcy.

I’m kinda sick of surviving. At least Darnell is done with this world.
-- Trina (Chapter 12 paragraph p. 62)

Importance: Trina, feeling horrified following the contamination of their village, and their friends by the virus, has lost hope. She is beginning to have survivor's guilt, as well as exhaustion from fighting to survive. She is tired of having to struggle so hard to stay alive.

The world is beset with evil in many forms.
-- Crazed Woman (Chapter 24 paragraph p. 123)

Importance: Although...