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

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

Diggle [to Oliver]

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.

Diggle: Find what you're looking for?
Oliver: Took down three Vertigo pushers tonight, Diggle. Last one finally knew a name. The Count.
Diggle: The Count. That's worse than The Hood.

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?

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.

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.

So Laurel's on her own against a murderer who burns people alive?

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

Diggle: Woah. That's a neat trick. You gonna teach me that someday?
Oliver: No.

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

Arrow Quotes

Oliver: Are you alright? Diggle had mentioned that maybe you were feeling a little left out.
Felicity: What? No. I just used to being your girl. I mean, not your girl, girl. Your girl. I know it sounds like the same word, but it means something different in my head.
Oliver: Hey. You will always be my girl, Felicity.

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.