Elle: (after Morgan finds a hollow space in the wall) Definitely an Indiana Jones movie!
Morgan: Oh, there he is. Pretty boy. Last chance. I can get my man to swing you a hotel room for practically nothing, even you might get a little lovin' out there!
Reid: Thanks, anyway.
Morgan: Come on, Reid, live a little, huh?
Morgan: (on Reid) He look okay to you?
Elle: He looks about the way I would if I was gonna spend two weeks with my family.
Gideon: I'll be lost in a cabin in the woods for the next two weeks, do not call me for anything, have a great time, you all deserve a break! Seriously, don't-don't call!
Gideon: Writer Elbert Hubbard said: "No man needs a vacation so much as the man who has just had one."
Morgan: (on the resort) Come on, did I lie to you?
Elle: You did not lie!
Morgan: Gotten me a better deal on my room?
Gerald Dupree: You want me to show you a brochure with the real rates?
Morgan: Hey, hey, I'm done, I'm done, I'm done!
Morgan: (spotting a beautiful woman on the beach) Ooh, wait a minute. Look at that right there, Looord, have mercy! I think I need to handle something.
Gerald Dupree: You need any backup?
Morgan: You better watch your mouth!
Garcia: My humble servant? Why can't the real world be like this?
Garcia: JJ, this guy is amazing.
JJ: Oh, gosh. Please don't tell me you have a crush on a fictional character?
Garcia: He's not fictional. He's the online alterego of a real person.
JJ: Mmhmm, you don't even know anything about him... or even if he is a him.
Garcia: Okay, you know what? I don't... look, we meet online at specified times that he is never late to. We spend hours adventuring and chatting during which time I have his undivided attention and he lavishes me with flattery.
Garcia: When was the last time you had a date go that well?
JJ: See if he's got a fictional brother, alright?
Garcia: Yeah, he doesn't.
JJ: Cousin... uncle... grandfather, whatever.
Dr. Jesson: What makes her most happy are her journals and your daily letters. She is exceptionally proud of you.
Reid: She is?
Dr. Jesson: Talks about you all the time, to anyone who will listen - staff, other patients. Her journals are filled with the cases you write to her about. Calls them your adventures.
Reid: Mom's of the believe you can find adventure all around you if you just look. It's what happens when you're a professor of 15th century literature.
Morgan Well, you alright there, Greenaway?
Elle: For the hundredth time... I didn't even know that there was a victim until you dragged me out of bed!
Detective St. Pierre: Where's the victim's head?!
Elle: Well, I must've dropped it on my way in here - come on! You know that I have nothing to do with this! I'm an American FBI agent! I'm here on vacation, man! I'm the police just like you.
Morgan: Garcia, I need a rundown on a guy.
Garcia: The Information Superhighway is closed.
Morgan: What are you talking about?
Garcia: Someone had the nerve to run a black cat op into my computers, Morgan, they hacked me, okay?! But you can bet your sweet ass I will find them, I've got honeypot farms hidden behind UML kernel data packets and a first generation honey net I personally programmed! My snort log list, every visitor, every server request, every keystroke of this entire network, if I have to backhack his IP all the way to the fricken stone age, I will find this son of a bitch, okay?! So, bye!
Aaron: How much sleep have you gotten in the last 24 hours?
Elle: Hotch, I spent half of the night in an interrogation room. I am not sleeping until I find this Frank Giles.
Morgan: Unsubs... they don't contact us this way. I mean, they might taunt us, dare us to catch 'em but they don't drag us into their fantasies.
JJ: Why not?
Morgan: Because they're sexual fantasies. I mean, taunting us is a show of power but making us the object is... I don't know what the hell that is.
Garcia: I was playing a game yesterday. An online game.
Gideon: A game?
Garcia: Not on the Bureau computers, sir, on my own personal laptop.
Morgan: No, Garcia, no-no-no-no...
Hotch: I don't understand.
Morgan: Wireless internet.
Garcia: By wirelessly hooking into the net here to get online, the hacker could've gotten into my computer first and... I have far less protection on my own laptop.
Hotch: And he could've gotten into the entire Bureau computer system this way?
Garcia: Yeah, it's possible.
Gideon: A game... are you that stupid?! Information files... you have a responsibility.
Garcia: I know, sir, I'm so sorry.
Elle: (after Reid explains the medieval significance of the term "hour be none") Reid, do not ever go away again!
Morgan: It's a box.
Hotch: Take it out.
Reid: Wait, wait, are we sure that's safe?
Hotch: What? You think it's a bomb, you think he'd be playing this game just to blow us up?
Morgan: He'd have already done that as long as we'd been standing here.
Many of the "clues" that the team gets -- the skeleton key, the sword, the improvised sundial and its medieval marking of time, the species of butterfly JJ receives (from Great Britain) and the Old English vocabulary the unsub writes in coupled with other references like the profession of Reid's mother and Garcia's game could mean the team needs to look for a book dealing with either Arthurian legend or the story of King Arthur himself.
Taking into consideration the first analysis and the clues given throughout the episode, another possibility for the book the team needs could be the Divina Commedia (Divine Comedy), by Dante Aligheri.
The Commedia, written in about 1305 and set in 1300, was about the author-as-Pilgrim's journey through the Inferno (Hell) to discover the results of evil, ascending toward the terraces of Purgatorio (Purgatory) to learn about repentance so as to one day be allowed entrance into Paradiso (Paradise).
One point that makes this another choice for the book are the drawings on the unsub's desk (the ones under and around the photos of Gideon, Hotchner & co.) which look to be more like those of the Inferno than those of Camelot and its conquests.
Another is in Hotch's message: the unsub tells them to "disregard the first two deaths" because the victims were "...unrepentant men." Penitence is a key point of the Purgatorio, which upon a person's completion of his stay there could gain access into heaven.
Still another is the girl. While this fits in with the medieval cliche of the "damsel in distress," it could be an allusion to Beatrice, the woman Dante adored and who, in the Commedia, started Dante on his journey in hopes of saving his soul from damnation. Perhaps the "quest" is about not only saving the girl but saving themselves?