Felicity and Oliver in “Unfinished Business”

Felicity

But there is one thing I need to ask you to do. And you're not going to want to.

Oliver

Well, if it's you asking, I'll do it.

Felicity

Kill him. You have to kill Ra's al Ghul. This is a duel... Oliver, with one of the most dangerous men that has ever walked the Earth.

Oliver

I wouldn't be doing it if I didn't think I can win.

Felicity

I don't doubt that. I don't doubt that you can beat him. I am terrified that you won't kill him. Because that's not who you are anymore. And I am so afraid that Ra's al Ghul will use your humanity against you.

Oliver

Felicity, I honestly don't know if I'm a killer anymore. But I do know two things - the first is that whoever I am, I am someone who will do whatever - whatever - it takes to save my sister.

Felicity

And the second thing?

Oliver

I love you.