I am not going to put the other 35,000 men and women of this department through the ringer for one cop's crusade.

Effort does not guarantee outcome.

Some mistakes time erases and some it does not.

Not nice is not grounds for a justifiable homicide.

I can tell you what the Irish in me truly dreads, ultimatums delivered in British accents.

It's hard to do the right thing when you don't know what the right thing to do is.

Garrett: You'll play nice?
Frank: Right up until nice doesn't work.

Mayor Poole: Sorry to keep you waiting, Frank.
Frank: It's what we do, you and I.

Do good work. Come back safe.

That flag that you consider a prop and a stunt has draped the coffins of Americans who died to give you the right to ignore that sacrifice. You're spitting on their graves.

Only a fool seeks peace by inciting violence.

Frank: Battle for Peace is an oxymoron.
Garrett: Emphasis on moron.