Castle: The killer can't be a ballet dancer because it'd just be such a huge let down.
Beckett: Of course, we can't let facts get in the way of a good story.

Castle: Our killer is a ninja.
Beckett: Or he is just an athletic person with a hooded track suit.

This place is seriously creepy for a cookie factory.

Castle: See what happens when I leave you alone.
Beckett: Babe, I wasn't alone. When they were interrogating me, the only thing that kept me going was thinking about you. About our future, the wedding. You were with me the whole time.

So what's Gates up to besides sabotaging our domestic bliss?

Castle: You should know it, you're engaged to a genius.
Beckett: Yes, a genius at annoying me.

This case is exceeding even my loftily expectations.

I think I'm man enough to admit I'm completely theory-less.

11 seconds to a confession. That's got to be your personal best.

Castle: Do I smell coffee?
Beckett: If you do, it was made by elves.

Everything I've ever done, every choice I've ever made, every terrible and wonderful thing that's ever happened to me, it's all led me to right here, this moment with you.

That gun's not going to be much help when Lucas rips it from your hand with his mind.

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.