I think we may have just dug our own graves.

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.

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

You can not leave behind what is always at your side.

Believe me, Beckett has plenty of experience taking a bullet for other people doing stupid things. Hell, she's married to me.

Ryan, this is my third marriage. I think I know what I'm doing.

This is going to be fun this little threesome here. Investigatively speaking.

Kubrick was right. A. I. is a bad idea.

I wanted to go to Mars not die on Mars.

Space. The final frontier. These are the voyages of Castle and Beckett. They're ongoing mission to explore strange, new motives. To seek out new witnesses, new suspects for murder. To boldly go, oh, right over here.

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.

Castle Quotes

I can't help it if you got off by putting things in my mouth.

Beckett

Castle: They're going to kill you Kate, and if you don't care about that, please think about how that's going to affect the people who love you. You really want to put your dad through that? What about Josh?
Beckett: And what about you Rick?
Castle: Well of course I don't want anything to happen to you. I'm your partner, I'm your friend.
Beckett: Is that what we are?
Castle: You know what? I don't know what we are. We kiss and then we never talk about it. We nearly die frozen in each others arms, but we never talk about it. So no, I got no clue what we are. I know I don't want to see you throw your life away.