Felicity: Well his daughter still lives in this world. He must know that.
Oliver: He knows. He just doesn't care. He's lost all hope.
Diggle: Yeah, just like all of us.

I'm now powered by the deaths of tens of thousands of souls. There's nothing you can do to stop me.

Damien Darhk

Felicity: Go to hell.
Darhk: Why bother? I'm going to bring it to us.

People still need saving. They still need hope.

Oliver

Because I have hope.

Oliver

I'm sorry. Did I leave you with the impression I was a rational guy?

Lonnie Machin

So many promises were made to save this city, but it all just fell apart, and we were the ones left in the rubble. Damien Darhk gave us hope. Can you, with your masks and your guns, say the same?

Ark guy

Thanks, dad.

Felicity

I have no idea what you're talking about. Just get the son of a bitch.

Donna

Donna: You're always such a stick in the mud.
Noah: Yes! Let's all take hacking advice from a woman whose only use for her smartphone is as a mirror.

Oliver: I should have taken your head.
Malcolm: That's always been your problem. The inability to do what's necessary.
Oliver: Laurel is dead because of you.
Malcolm: What are you gonna do? We've already established you're not going to kill me.

Curtis: If you're Felicity's dad, and you were married to Donna, you [pointing to Felicity] make so much more sense now!
Felicity: Yup.

Arrow Season 4 Quotes

Oliver: Felicity, wanna play a game?
Felicity: What game are we playing?
Oliver: We're playing the "reason you know so much about these ghosts is beause you've been helping the team behind my back" game.

Laurel: We need the Arrow.
Oliver: The Arrow's dead.
Laurel: We're hoping that's not the case. We're hoping that you can't change who you are in your bones.