You know Oliver, somebody once told me that secrets have weight. The more you keep, the harder it is to keep moving.

Oliver: John, I don't want to die down here.
Diggle: So don't, Oliver.

Felicity: Guess what I majored in. Hint - not the secretarial arts!
Oliver: Felicity! If I'm going to be Oliver Queen, CEO, the I cannot very well travel down 18 floors every time you and I need to discuss how we spend out nights.
Felicity: And I love spending the night with you...three...two...one. I worked very hard to get where I am and it wasn't so I could fetch you coffee!
Diggle: Well, it could be worse. My secret identity is his black driver.

Oliver: We're late.
Diggle: The good news is you get to make your dramatic entrance.
Oliver: Oh I'm just glad Oliver Queen has a reputation for showing up late.
Diggle: You know, I've been meaning to tell you it really wears me out no end the way you refer to yourself in the third person like that.

I think you didn't have a problem with Felicity’s performance until she met Barry Allen.

You're like a dope fiend who thinks he can deal with his own addiction by making another addict go straight.

Diggle [to Oliver]

Diggle: What did you want?
Felicity: Is that any way to treat a girl who just walked up six flight of stairs?
Diggle: No, it's not. Welcome.

Besides, Army regulations. A brother never lets a soldier go into battle alone.

Felicity: Where are we going to get our hands on a rare Spanish antiquity?
Diggle: You really have no idea how rich his family is, do you?

I take back every joke I made about you sticking a tracking device in your boot.

They need the man in the hood.

I thought you took that book off your father's dead body. How could he have been so chatty?

Arrow Quotes

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

Barry: You tortured that guy.
Oliver: I interrogated him.
Barry: When my friends said that you were a criminal, I defended you because I thought you were supposed to be a hero. I thought we were supposed to be better than them.
Oliver: Barry, you live in Central City, where it's sunny all the time and your enemies get cute nicknames. You're not in Central City. I live in the city where my best friend was murdered. Where a woman I loved was shot full of arrows and sent tumbling off of a rooftop, where my mother was murdered right in front of me, so before you...
Barry: My mother was murdered right in front of me, too. But I don't use my personal tragedies to just torture whoever pisses me off.
Oliver: Well I'm sorry, Barry, but I'm not as emotionally healthy as you are.