He's the beating heart of 51.

Boden

Platt: It's me that should apologize. I mean yeah, that proposal was really messy and half-assed, but then again so are you. But, you are also the kindest and most honest man I have ever met, and I would be the luckiest girl on Earth to call you mine. Randall McHolland, will you marry me?
Mouch: Trudy Platt, marrying you would be my greatest honor.

Freddie: What happened to Herrmann bro, I didn't mean to man, it just happened.
Cruz: You let it happen Freddie. Don't ever forget that. You let it happen.

Freddie: You want me dead for what I did.
Cruz: Freddie, I am mad as hell, yeah, but I do not want you dead.

You know what? Just tell him he better hope the cops find him before I do.

Cruz

With all due respect sir, go to hell.

Patterson

Chief, I don't know who Roger Maddox had to step on to get where he is in life. but he picked the wrong people this time. We're the ones who run into the fires when the rats are running out. He's just another rat. We're gonna step on him.

Dawson

Dawson: So, how you feeling?
Boden: Like I've got a rock hanging over my head. Rope holding it up is about to snap.

Hermann: Hey, any word on the Chief?
Mouch: I left him three messages that we were buying.
Hermann: Free drinks are usually catnip to him.

Otis: Job's yours if you want it, Freddie.
Freddie: Yeah?
Hermann: Yeah, I mean you're gonna have to shower a little more often, 'cause we run a really classy joint.

Boden: The truth is gonna come out, ok?
Donna: I hope you're right. I don't know how much longer I can do this.

Jimmy: Hey guys, the tortoise is getting away.
Dawson: Mouch, you gonna stop it?
Mouch: What's the rush?

Chicago Fire Season 4 Quotes

Otis: Candidate's late on his first day?
Mouch: Now that takes gumption.

Patterson: I'd like you to remain with the company. Your reputation as a firefighter is not in question.
Severide: No, just my ability to lead.