- Dr. Spencer Reid: [closing quote] "Cannot be seen, cannot be felt. Cannot be heard, cannot be smelt. It lies behind stars and under hills and empty holes it fills. It comes first and follows after, ends life, kills laughter." - J.R.R. Tolkien
- Dr. Spencer Reid: [opening quote] "How can I be substantial if I do not cast a shadow? I must have a dark side also if I'm to be whole." - Carl Jung
- Dr. Spencer Reid: No one in here is honest.
- David Rossi: They could just be numb to be it all.
- Dr. Spencer Reid: Well, I'm not.
- David Rossi: You never will be because you're a good person. That's the difference.
- Liz Hammond: It reminds me of when my dad died. I keep having this flash of my mom. She's sitting there, mourning, you know? I realized that they're all widows. Widows! It got me thinking, there's no word for a mom who loses a child. Or for a little girl who loses her world. Attie asked me the other day if she'd still be a sister if we don't find Katie.
- Jennifer Jareau: Attie will always be a sister, okay. She has to believe that! Okay?
- Calvin Shaw: [to Reid] Look, I know it's hard to think outside the box, when you're in a box, but think about the moves.