There are times when a well placed pawn is worth more than a king.

Mysterious Man

It's a long game, Kate. Play it piece by piece.

Gates

This is politics. Perception is reality. The truth won't matter.

Give him a chance because the moment you make a move on him, his career is over.

Castle: So we can narrow our suspects down to rich men with good taste.
Beckett: You saying you're a suspect?

So how's the case of "the phone sex girl who knew too much" going?

Martha

That's going to be like looking for a needle in a needlestack.

These investigations are like wet dynamite. One misstep and it all blows up.

Gates

It's not a sweat shop, it's a sex shop.

An officer and a gentleman. That could be the name of our crime log.

She's the best.

Castle: I hate going to weddings alone.
Beckett: Well maybe we could be each others' plus ones.

Castle Season 4 Quotes

Every morning I bring you a cup of coffee, just so I can see a smile on your face. Because I think you are the most remarkable, maddening, challenging, frustrating, person I've ever met. And I love you Kate, and if that means anything to you, if you care about me at all, just don't do this.

Castle

You have thirty seconds to suit up.

Castle