- Kate Beckett: The moment that I met you, my life became extraordinary. You taught me to be my best self, to look forward to tomorrow's adventures. And when I was vulnerable, you were strong. I love you, Richard Castle, and I want to live my life in the warmth of your smile and the strength of your embrace. I promise you I will love you. I will be your friend and your partner in crime and in life, always.
- Richard Castle: The moment we met, my life became extraordinary. You taught me more about myself than I knew there was to learn. You are the joy in my heart. You're the last person I want to see every night when I close my eyes. I love you, Katherine Beckett. And the mystery of you is the one I wanna spend the rest of my life exploring. I promise to love you, to be your friend, and your partner in crime and life. 'Till death do us part, and for the time of our lives.
- Kate Beckett: Why do you always have to touch everything?
- Richard Castle: I thought you liked that about me.
- [Ryan has two suspects in custody]
- Kevin Ryan: Hey, Castle, you missed all the excitement. We were awesome. Weren't we, Javi?
- Javier Esposito: As usual.
- [reading from his file, trying to prove to alternate universe Ryan and Esposito something doesn't make sense]
- Richard Castle: Whoa. Whoa, whoa, whoa. Hey. It says here I jumped on a Macy's Parade float and sang "Let it Go" with Idina Menzel, and then landed a hot air balloon naked in Central Park. I didn't do these things, guys. Come on. I would never sing "Let it Go" as a duet.
- [coming to after being transferred back]
- Richard Castle: It's you!
- Kate Beckett: Yeah.
- [Castle grabs her left hand and sees the engagement ring]
- Richard Castle: *My* you! I'm back!
- [in the alternate universe after a man sticks a gun against his side]
- Richard Castle: I hate this world.
- Richard Castle: And I keep trying to figure it out... how do you live with the man who's lost two months of his life and left you at the altar? How do I live with... the pain I know I've caused you? How do we get past this?
- Kate Beckett: I wish I knew.
- Richard Castle: I think I have the answer. We just do. So, Katherine Beckett, will you marry me?
- Kate Beckett: I've already said yes.
- Richard Castle: Will you marry me right now?
- [in the alternate universe to an unknown girl sitting on his lap and trying to kiss him]
- Richard Castle: Okay, wait, uh, oh, I... I-I really can't do this.
- Chelsea: Sure you can. Sure you can. I got a couple little blue pills in my purse.
- Lanie Parish: [Castle is sniffing something on the victim] Castle, what are you doing with my body?
- Kate Beckett: Just pretend like you don't know him.
- Richard Castle: [to Beckett] It's like "It's a Wonderful Life." Every time your phone rings, a victim gets their wings.
- Kate Beckett: This is the fourth night in a row that you haven't slept. Something wrong?
- Richard Castle: I don't know. Maybe my subconscious has a pressing need to catch up on my Facebook likes.
- Richard Castle: [seeing a wedding invitation on the kitchen counter] "Ms. Katherine Beckett"? What's this?
- Kate Beckett: Oh, an ex is getting married. Do you remember Will Sorenson?
- Richard Castle: Your old FBI squeeze?
- Kate Beckett: Yeah.
- Richard Castle: Oh, man, you're so lucky I came along and saved you from that life.
- Kate Beckett: Wait, you "saved" me?
- Richard Castle: Come on. Even you have to admit he was boring. Like... C-SPAN boring.
- Kate Beckett: You know, what makes you think that I would be with Sorenson if you hadn't come along?
- Richard Castle: All right. Where would you be?
- Kate Beckett: If you weren't around to distract me?
- Richard Castle: Yeah.
- Kate Beckett: Um, I would probably be... captain of my own precinct.
- Richard Castle: Wow.
- Kate Beckett: Yeah.
- Richard Castle: Okay. Had I not been bewitched by you, I think by now I'd be working on my second Pulitzer.
- Kate Beckett: So we're bad for each other, huh?
- Richard Castle: The worst.
- Kate Beckett: [they kiss] I guess we'd both be better off if we never met.
- Richard Castle: So, you thinking about going?
- Kate Beckett: Going where?
- Richard Castle: Sorenson's wedding. Take a little trip down memory lane?
- Kate Beckett: I don't think that's such a good idea.
- Richard Castle: Why not?
- Kate Beckett: I'm not really ready for someone else's perfect day.
- Richard Castle: You know I'd give anything to change what happened, right?
- Kate Beckett: Yeah, I know you would.
- Kate Beckett: What the hell do you think you were doing? You could've gotten yourself killed.
- Richard Castle: I had backup. And I did help capture a suspect.
- Kate Beckett: No, you were supposed to accompany and observe, not participate and...
- Richard Castle: Annoy!
- Kate Beckett: Risk my people's lives. Now, after this morning's antics, I expected you to be on your best behavior.
- Richard Castle: Actually, that kind of is my best behavior.
- Kate Beckett: [seeing Esposito] What?
- Javier Esposito: Oh, I'm just enjoying the show.
- Kate Beckett: [in the alternate universe] What is it with you and this case, Mr. Castle?
- Richard Castle: Well, I'm a mystery writer. I'm compelled to know how the story ends.
- [in the alternate universe, Castle tries to find out what happened to this world's Alexis]
- Richard Castle: What happened between us? Why did you move to LA?
- Alexis Castle: You know why.
- Richard Castle: Uh... Tell me again.
- Alexis Castle: Because you gave up. You read all those terrible reviews on your magnum opus and you couldn't move past it, and I couldn't stick around and watch... But you know what? Now I think I understand it.
- Richard Castle: What do you mean?
- Alexis Castle: I had all these plans, you know? To change the world. But this non-profit I'm working for, everything we do seems so small and pointless. It's like nothing I do matters, so why try?
- Richard Castle: Sweetie, no, uh... Everything you do matters. Every moment, every decision you make, it effects the people around you, it changes the world in a... a million imperceptible ways. No matter what your reality, you can make it better... We both can.
- Alexis Castle: [long pause] I've missed you dad.
- [first lines]
- Renzo Conrad: Long flight?
- Mathias Gensler: Endless... How much further?
- Renzo Conrad: You have some time. If you want to sleep, go ahead, sir.
- [last lines]
- Richard Castle: Mrs. Castle, may I have this dance?
- Kate Beckett: There's no music.
- [Castle takes out his phone and starts a song and they begin to dance]
- Kate Beckett: It's perfect.