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.

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

Diggle [to Oliver]

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

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.

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.

Malcolm: John?
Diggle: My friends call me Dig. You? Shouldn't even talk to me.

They need the man in the hood.

Arrow Quotes

Are you done?
Oliver; Yeah, I'm done. I'm done taking the blame and I'm done caring. Why don't you go have a drink. Get wasted. Go to Verdant. I'll pay for it. I have loved you for half of my life but I'm done running after you.

Laurel

Oliver Queen is dead, eventually to be reborn as Ra's al Ghul. For now, only the Arrow, Al Sah-him, shall remain. Al Sah-him, Heir to the Demon.

Ra's al Ghul