Billy Costigan: Listen, listen. I got like, like thirty thousand bucks, right? Insurance money. You know, after my mother passed and everything?
Cousin Sean: Yeah, yeah.
Billy Costigan: In your line of work, if I gave you like what, ten thousand, what could I get back?
Cousin Sean: You know... you know what you usually say at these moments?
Billy Costigan: What? What?
Cousin Sean: C'mon, man.
Billy Costigan: Aw, come on, you fucking moron. Come on. What, you want me to say it? Huh? I'm not a cop, alright? I'm your fucking cousin.
Cousin Sean: Yeah, you're bad! You corrupt fuck, man! You must be my cousin.
Billy Costigan: No, I gotta get out. I can't be doing this anymore. You know what's gonna happen?
Oliver Queenan: What?
Billy Costigan: I know he's gonna find out who I am and he's gonna fucking kill me.
Oliver Queenan: I'm really sorry... I swear to God I am. I'll get you out of this. It won't be immediately but I will get you out. Two weeks at most.
Billy Costigan: [coming from behind the wall to surprise Sullivan] Freeze!
Colin Sullivan: Whoa! Put the fucking gun down!
Billy Costigan: Put your fucking hands up!
Colin Sullivan: Alright, alright. I can get you your money!
Billy Costigan: What did you say?
Colin Sullivan: I said I can get you your...
Billy Costigan: [punches Sullivan across the face] You didn't come here to talk, you came here to get arrested.
[Slaps cuffs on him]
Colin Sullivan: You have fucking tapes of what? Costello was my informant. I was a rat? Fuck you, prove it.
Billy Costigan: [standing Sullivan up] Get up!
Colin Sullivan: What is this? A citzens arrest? Blow me. Only one of us is a cop here Bill. Did you hear me Bill? No one knows who you fucking are!
Billy Costigan: Will you shut the fuck up!
Colin Sullivan: I'm a sargeant in the Massachusetts State Police, who the fuck are you? I erased you!
Billy Costigan: [slams Sullivan against a wall] You erased me, huh?
Colin Sullivan: Yea... shoot a cop, Einstein, watch what happens.
Billy Costigan: What would happen is this bullet would go right through your fucking head!
Colin Sullivan: Watch what happens!
Billy Costigan: What? So you can get the parade? The bagpipes and bullshit? Fuck you! Fuck you! I'm fucking arresting you!
Colin Sullivan: That's the stupidest thing you could do.
Billy Costigan: [while hitting him] Shut the fuck up!
[Sullivan falls to the ground]
Billy Costigan: I could give a fuck if the charges don't stick... I'm still fucking arresting you.
Colin Sullivan: [dazed] Shit.
Billy Costigan: [during a counseling session] There was a cop leaving when I came in.
Madolyn: How did you know he was a cop?
Billy Costigan: Know, bad haircut, no dress sense, and, you know, a slight air of scumbag entitlement.
Billy Costigan: [during a counseling session with Madolyn] You sit there with a mass murderer. A mass murderer. Your heart rate is jacked, and your hand... steady. That's one thing I figured out about myself in prison. My hand does not shake... ever.
Billy Costigan: [During a therapy session] Is it to do some good to get somewhere personally or just for the fuck of it?
Madolyn: Well I expect some people do it to keep things on an even keel
Billy Costigan: So you had a parent who was a drunk?
Madolyn: Did you?
Billy Costigan: No
Madolyn: Let's keep it with you, talk about how you feel
Billy Costigan: There was a cop leaving when I came in, do you see cops?
Madolyn: That's part of what I do I don't normally see cadets who've just been kicked out of the academy
Billy Costigan: You should get a better job
Madolyn: Should I?
Billy Costigan: So do all those cops come in here and "cry"?
Madolyn: Sometimes they do, if they had trouble at home if they had to use their weapons
Billy Costigan: Use their weapons? They signed up to use their weapons most of them but they watch enough TV so they know they have to weep there is no one more full of shit than a cop, except for a cop on TV
Billy Costigan: [during Costigan's interview] Do you lie?
Madolyn: Why? Do you?
Billy Costigan: No, I'm asking if you lie.
Madolyn: Honesty is not synonymous with truth.
Billy Costigan: [amused] Yeah, you lie. You lie.
Billy Costigan: [in Costello's bar] Frank, how many of these guys have been with you long enough to be disgruntled, huh? Think about it. You don't pay much, you know. It's almost a fuckin' feudal enterprise. The question is, and this is the only question, who thinks that they can do what you do better than you?
Frank Costello: The only one that can do what I do is me. Lot of people had to die for me to be me. You wanna be me?
Billy Costigan: I probably could be you, yeah. Yeah, I know that much. But I don't wanna be you, Frank. I don't wanna be you
Frank Costello: Heavy lies the crown... sort of thing.
Billy Costigan: [in Costello's bar] You're seventy fucking years old. One of these guys is going to pop you. As for running drugs, what the fuck. You don't need the pain in the ass, and they're going to catch you. And you don't need the money.
Frank Costello: I haven't "needed the money" since I took Archie's milk money in the third grade. Tell you the truth, I don't need pussy any more either... but I like it.
Billy Costigan: [in Pakistani Proprietor's store] Hey, you fellas come from Providence?
Providence Gangster #2: Isn't any of your business where we come from, is it, now?
Billy Costigan: Fuckin' delivering cannolis or something?