Quentin Lance is a former detective on the Starling City police force who was demoted back to beat cop after the events in "Sacrifice." He is also the father of Laurel Lance and Sara Lance. 

He was once committed to bringing down The Hood at any cost, but after The Undertaking he had a change of heart and has started to work with The Arrow (a name he decided better fit the vigilante) to help him fix the broken Starling City.

Quentin Lance Quotes

You sent Felicity Smoak to warn me to leave town. You know The Arrow. You're the girl in the mask. You've been kicking the crap out of creeps in The Glades.

Lance

Warrior: Guns are a coward's weapon. What are you without your sidearm?
Lance: A guy with a spare.

Arrow Quotes

Sara: That's not true. I wanted to kill Roy because that's what I do. That's who I am. I spent six years in the darkness and I looked into the eyes of the devil and I gave him my soul.
Oliver: I can help you get it back.
Sara: No. You deserve someone better. You can harness that light that's still inside of you, but I'm not that person and I never will be.

There is a prophecy. The man who doesn't perish at the blade of Ra'a al Ghul will become Ra's al Ghul. Ra's al Ghul doesn't offer, he orders. Oliver! Don't delude yourself into thinking you have a choice.

Malcolm