Castle: The fact that you even think that breaks my heart. I would walk into a tornado for you, Kate.
Beckett: And I would die if I lost you.

Well she was shot in the head so unless she tripped and fell on a bullet, it wasn't an accident.

Castle: Kate, I have never given up hope, not since the day we met and that will never change until you tell me it should.
Beckett: Then don't change, ever.

Castle: They've been through way too much together to give up on what they have.
Beckett: You're a wise man Castle, with a big heart and you're rather good looking too.
Castle: You might want to pace yourself with the flattery. You've got a whole dinner to get through.

Beckett: Martha, we're not getting a divorce.
Martha: Well, call me old fashioned but don't married couples live together?

Beckett: It's complicated.
Martha: So were his last two divorces.

Beckett: I didn't do this to hurt you, I did it to protect you.
Castle: Then why am I so angry?

Castle: Do you have any idea how worried I was?
Beckett: Yeah, I do. I was gone for 36 hours. A year ago you were gone for eight weeks.

Beckett: I mean, what did you want me to do?
Castle: Tell me the truth.

Castle, just shut up and kiss me.

Look on the bright side, chicks dig scars.

Worst thing I thought I was going to be facing was working without Castle, and then you called.

Castle Quotes

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

Castle

Castle: How do you know when you're in love?
Beckett: All the songs make sense.