Kate: Look I signed up for this when I put that badge on. You didn't. It's not your fight.
Rick: The hell it isn't. I don't run around you just to annoy you, I don't write up murder scenes in the middle of the night to satisfy some morbid curiosity. If that's all this was I would have quit a long time ago.
Kate: Then why do you keep coming back Rick?

You have a great talent, no one had said anything like that to me before.

Shut the front door.

The only luxury I really care about is freedom.

Detective Beckett, did you call to tell me a bedtime story?

Money doesn't change who you are, it just magnifies your personality.

Good thing I'm not a one hit wonder.

You got to watch those silhouettes they can be shifty little bastards.

Beckett: Thanks for having my back in there.
Castle: Always.

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 at the police station in order to finish them.
Castle: It's not about the books anymore.

The problem is neither of us are in love.

He's an identical twin who wears glasses. That's the worst disguise since Clark Kent.

Castle Quotes

I need time to stop being mad and you need time to figure out a way to be OK with this.

Alexis

I tried to stay in the car I really did.

Castle