Beckett: I thought you were breaking up with me.
Castle: By giving you a ring?

Kate, I'm not proposing to you so you'll keep your job or because I'm afraid I'm going to lose you. I'm proposing because I can't imagine my life without you.

Katherine Houghton Beckett, will you marry me?

How am I supposed to be in a relationship with her if she won't let me in?

What does that say about us? Not much if you ask me.

You knew what this would mean and you didn't include me.

I'm sorry, you interviewed for another job in another city and didn't tell me?

I looked it up. Toucans are extremely aggressive.

Castle: I was pretty close.
Beckett: If by close, you mean opposite.

Warburg. Sounds like a Bond villain.

It's rise of the machines.

That theory is highly improbable and coming from me, that's saying something

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.