Do you remember what you told me? It takes a monster to kill a monster.

Flashback Oliver

Oliver: I'm not so sure that finding this guy depends on gambling.
Felicity: It's not gambling when I play.

Felicity: Every time you face a setback, you throw yourself a pity party.
Oliver: It's not a pity party. It's acceptance.

That has always been the way with us, Felicity. You are the one who brings the light.

There's no length that I will not go to to avenge Laurel. To stop Darhk from ever hurting anyone again.

Do you know why I always blame myself in situations like this? Because at least it's an answer. Sometimes we just need a reason when a situation is completely unreasonable.

Oliver: I'm thinking.
Felicity: Which is Oliver speak for you're beating yourself up. I thought you were reformed from that?
Oliver: It feels like a good a time as any to bring it back.

As the world's leading expert on blaming himself, please don't do it.

Oliver: Why didn't you come to me with this?
Laurel: Come to you with what? Your expertise with magical resurrection or that judgmental look on your face?

Thea, I don't have the right to be mad at anyone for keeping secrets and I'm sorry that I made you feel as though you had to.

A part of me has always wanted you to see what kind of man I really am! I didn't expect to wind up finding out what kind of man you really are.

Oliver: Three years you've looked at me with contempt and utter disdain, so I'm wondering, do I have that look on my face now?
Lance: What the hell you talking about?
Oliver: I'm talking about you...and Damien Darhk.

Arrow Quotes

Laurel: Helena, you don't have to do this.
Helena: Yes, I do. Because once you let the darkness inside, it never comes out.

As much as he was doing it to give me a chance to survive, I believe that he was also atoning for his sins. I need to right the wrongs done by family.

Oliver