- Dr. Spencer Reid: [to Detective Spicer] Evil can't be scientifically defined. It's an illusory moral concept that doesn't exist in nature. Its origins and connotations have been inextricably linked to religion and mythology. This offender has shown no signs of any belief. I'm... I'm Spencer Reid.
- Derek Morgan: [voiceover, opening] Alfred Lord Tennyson wrote : And out of the darkness came the hands that reach thro' nature, moulding men.
- [a young child is a witness to his mother's murder]
- Derek Morgan: Hey. Look, I'm really glad the kid didn't see anything, but it could have been helpful.
- Detective Matt Spicer: But covering his eyes like that, that means he couldn't cover his ears.
- Derek Morgan: Come on, think. Who was it?
- Billy Flynn: [in Detective Spicer's flashback] Hello there.
- Detective Matt Spicer: He was... He said "Hello there."
- Derek Morgan: That was his first message. What's he doing?
- Dr. Spencer Reid: Was she able to identify him?
- Jennifer Jareau: She said he was white with mean eyes and repulsive breath
- David Rossi: Rotten inside and out
- Emily Prentiss: [Brings her laptop showing a video link with Garcia] Guys, Garcia has something
- Penelope Garcia: Okay, everybody needs to sit down, 'cause I'm about to rock your world and not in the way I like to do it!