Kevin Ryan: When I started in Narcotics, I was so green. I-I didn't know how things worked. One day, there's this major bust - street gang cooking meth. They're stacking up guys in the bullpen, taking their statements one by one. Place is a zoo. I'm answering phones in the squad. Girl on the line, name of Alisha, asking for my lieutenant. So I call out across the bullpen "Hey lou, Alisha's on the phone for you."
[Beckett snorts with laughter]
Kevin Ryan: It was her tip that got these guys nailed, and all of them just heard me call out her name. Searched all day and all night, looking for her before the gang could get word back to the street that she was a narc.
Beckett: Well, did you find her?
Kevin Ryan: I did. Got her into witness protection, but... that was the stupidest thing I'd ever done as a cop. Until the day Jerry Tyson got the drop on me and stole my weapon.

Kira Blaine: Of all the murders, in all the cities, at all the weddings, and you walk into mine.

Lanie: [amused] Girl, I'm gonna smack you! You work side by side everyday. He writes a sex scene in his book about you that had me reaching for ice water. Now, little miss bride shows up. Don't tell me you're not the least bit jealous.
Beckett: Oh, please. You've been inhaling too many autopsy fluids. [Beckett begins to leave the room.]
Lanie: Honey, just because you can't see whats goin' on [Voice escalates as Beckett starts leaving] doesn't mean everyone else doesn't see what's going on!
Beckett: [from outside the room, in a singsong] Shut up!
Lanie: [to Sophie, the corpse] Mm-hmm. I see it. You may not, but I do.

Lanie: Getting a drink with me after work instead of getting your freak on with writer boy?
Beckett: What? He is annoying, self-centered, egotistical, and completely-
Lanie: Fun. And take it from me, girlfriend, you need some fun. I mean, how bad can he be?
Beckett: [answers phone] Beckett.
Castle: [excitedly] Guess who's got a date with a prostitute!

Lanie: I told you, it's none of your business.
Castle: Of course it's none of my business, that's why I want to know.
Kate: Know what?
Castle: What she and Esposito were fighting about.
Kate: That's none of your business.
Castle: That's the point.

Maddie: [To Beckett] You're hot for Castle. You wanna make little Castle babies!
Beckett: Maddie! He can hear us!

Martha: How did you get so smart?

Martha: I Heard about the shooting on the news. Could have been you. You know that, don't you?
Castle: Yeah, but I'm fine, wasn't me.
Martha: Richard, this isn't one of your books, you don't know the ending! You were just lucky yesterday.
Castle: [Somewhat nonchalant] You're overreacting, mother. Where is this coming from?
Martha: [Shocked and furious at his flippant attitude] How the hell can you ask me something like that? Think about how much you love Alexis, and that is how much I love you, and don't you dare ask me where this is coming from! You have gotten through most of life on your wit, and charm and no small amount of talent. But that is the real world out there, and you can't charm your way out of a bullet.
Castle: You think I should quit?
Martha: I think you should be honest with yourself about why you're doing this. You had written 22 novels before you met her, and you didn't need to spend every day in a police station in order to finish them.
Castle: It's not about the books anymore.

Martha: It's like when I was doing Who's Afraid of Virginia Woolf and I thought my understudy was trying to poison me.
Castle: Oh, yeah, the daily blood tests I paid for. Wait, she did poison you. The Swiss chocolate she gave you was a laxative.
Martha: Eh, added a certain urgency to my performance. But the point is, you indulged my paranoia. So therefore I'm going to be in the park - five 'o clock - at a discreet distance to make sure that Alexis' secret admirer is not an axe murderer.

Martha: Nothing you say will change how we feel. What men don't understand is the right clothes, the right shoes, the right make up, it hides the flaws we think we have, and make us look beautiful to our selves, that's what makes us look beautiful to others.
Castle: Used to be all she needed to look beautiful was a pink tutu and a plastic tiara.
Martha: we spend our whole live trying to feel that way again.
Season 2

Martha: Oh, Richard, darling, you're just in time. I made dinner. [Holds up a takeout container]
Castle: Mother, what are you doing here?
Martha: Oh, we're eating. You know, something families do a couple of times a day.

Martha: Richard. Whatever mistakes I've made in my life, I raised a good man.

Martha: This is... the best thing that has ever happened to you. Rejection is the bedrock of a great acting career. Until an actor has suffered, he hasn't really lived.
Alexis: Thanks, gram.
Martha: You're welcome. And besides, auditions are like men. There's another one right around the corner.

Martha: What if it doesn't work out? What if it does?
Castle: That's the cost of living.

Mike: We just got your Derrick Storm graphic novel, I mean, the art, the writing, it is, in a word, awesome!
Castle: Tell me, what's your favourite part?
Kate: You don't have to answer that question. His ego does not need anymore feeding.
Mike: Definitely where Derrick Storm escapes from the two bad guys by crashing the taxi cab.
Castle: Taxi cab!
Mike: Oh, I'm sorry, Detective Beckett, I should've said spoiler alert.
Kate: Oh, no, that's okay, I won't be reading it.
Mike: Really? I saw your name on our list. You preordered a copy.
Castle: Did she now?
Kate: I was just being supportive.