The Flash, Season 4

Iris:
Your husband has gone too far, and I think you know it, or you'd be with him right now.

Marlize:
Yes, I left my husband. But that doesn't change the fact that he's right. If anything, his betrayal proves his very point. Man corrupts even the best of ideas.

Iris:
"Pessimism isn't smarter than optimism. In this life, the bravest thing you can be is optimistic."

Marlize:
Familiar words.

Iris:
You said them when you were at Oxford. Two weeks before you met Clifford DeVoe.

Marlize:
I gave a speech. On technology and the elimination of world hunger. I truly believed it could be done.

Iris:
He tried to change you, Marlize. But I think, deep down, you are still an optimist. You still believe in humanity. And I believe in you. You asked me what I was willing to do for my husband. And now I'm gonna ask you... What are you willing to do for the world?