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.

Rick Castle: I don't know how you did it.
Kate Beckett: What?
Rick Castle: Kept it together the two months I was missing. Two days I didn't know where you were and it nearly killed me.

She’s as shrewd and high functioning of a sociopath as he ever was.

Kate Beckett: Castle, stop chasing the mice in your head.
Rick Castle: What if they're leading me to the truth?

Kate Beckett: Castle, do you realize how lucky you are?
Rick Castle: Extremely lucky, after all I'm married to you.

Kate Beckett: I'll give it to you straight. I'm just a girl, looking for a private dick.
Rick Castle: Whoa, then your search is over, sweetheart.

I think that if this is what you really want to do then I'm behind you all the way.

Castle: What happened to that rebellious girl with the leather jacket and the motorcycle? Would she say can't?
Beckett: She enforces the law now and drinks expensive wine.

Castle Quotes

Sometimes the hardest things in life are the things most worth doing.

Castle

Castle: You're not alone in this. I'm here.
Beckett: I know.