Doctor: Did they die of natural causes?
Niko Bellic: I suppose... A bullet in the head is as close to natural causes as anything in this city.

Niko, let's go bowling.

Hey, hey, you gotta listen to me, you gotta hear me, are you listening? It's not real man! It's a lie, it's all lies. The government lies to us. They put robots in the drinking water, they put spies in the toilets - to watch us! You think it's a joke, the joke's on you, they're killing you! You are being harvested by a marketing machine! You're not free, you're slaves! Freedom is a lie! They use drugs to control you, they did it to me for a long time. You need love! I need you, you need me, I love you! Love me back!

Brucie: Nicky, we gotta get serious.
Niko: All right man. If you want my advice, the only way you're going to get your balls back to normal is if you stop juicing or get implants.

Gordon Sargent: So you're in, big guy? Or are we gonna have to kill ya?
Niko Bellic: Well, since you put it that way... I'm in.