Just because you're smart and beautiful doesn't mean you have good judgement.

Relationships aren't math problems. You don't solve them by being practical.

Castle: What was your talent?
Martha: The way I wore a sweater.

How come I didn't hear about this on TMZ?

Death of a beauty queen. Scandalous.

You know what I thought when I first met you? You were a mystery I was never going to solve.

Castle: This is so weird, I dressed up as him for Halloween.
Beckett: I did too.

Castle: Worried you can't control yourself when we're alone?
Beckett: It's not me that I'm worried about.

Castle: Thank you.
Beckett: Always.

I want you all to myself. If that makes me petty, so be it.

Castle to Beckett

Captain: She's like a tiger in there, I never get tired of watching her.
Castle: Me either.

He was out playing grand theft auto.

Castle Quotes

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

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

Kate Beckett