I don't want to let him down. He wants this so badly and I want to give it to him but I just, I don't know that I can.

Kate Beckett: I mean, there's a reason why Capt. Gates doesn't get up on the stage and have fun.
Rick Castle: I just always assumed it was because she was genetically incapable of it.

Rick Castle: That thing in the shower. That is delightful.
Kate Beckett: That is not a routine. That's two naked people singing when there's no one around to see or hear it.

Back stabbing, adultery and betrayal. That is why I hate politics.

Rick Castle: I know I have occasionally theorized that a conspiracy was afoot.
Kate Beckett: Occasionally?

Kate Beckett: You texted Castle and not me?
Kevin Ryan: Well, when you have a crazy theory you don't call the voice of reason.

It happened on his watch so for Ryan it means it's all on him until he finds this guy.

Rick Castle: Checking you for bites and scratches. Just making sure you didn’t somehow get impregnated.
Kate Beckett: If you think that’s how I’d get pregnant we need to talk.

Kate Beckett: Wait, you signed up to go to Mars. When?
Rick Castle: A couple years ago.
Kate Beckett: Where was I?
Rick Castle: We were fighting.

Kate Beckett: Four adults together in one space, we're bound to step on each other's toes.
Rick Castle: Yeah, well there were a lot more toes than usual tonight.

Castle we have a murder. To solve not to commit.

Kate Beckett: Thanks for coming to get me.
Rick Castle: Always.

Castle Quotes

I don't get it. He's into you and your determined not to give into these feelings that you clearly have for him. So he fantasizes about you through his writing. It is literally verbal masturbation.

Natalie

I can't tell you how many times I've had dreams of being on this very ship.

Beckett