Quote by Victor Laszlo, Rick Blaine, Casablanca

Rick Blaine: Don't you sometimes wonder if it's worth all this? I mean what you're fighting for.

Victor Laszlo: You might as well question why we breathe. If we stop breathing, we'll die. If we stop fighting our enemies, the world will die.

Rick Blaine: Well, what of it? It'll be out of its misery.