Elena and Elijah in “Unfinished Business”

Elena

(about Damon and her part in the sacrifice) You'd think he'd understand why I'm willing to do this.

Elijah

Why are you?

Elena

I'm the key to breaking the curse. Klaus is here because of me. If I don't stop him, then he's going to hurt people. It's that simple.

Elijah

You know, there's a possibility this elixir won't work. I don't want to mislead you.

Elena

I know the chance I'm taking.