Klaus and Stefan in “Unfinished Business”

Klaus

You need to keep Damon in check.

Stefan

Be a lot easier if I could tell him the truth.

Klaus

You trust Damon with the cure? I imagine he prefers Elena the way she is.

Stefan

Nice try, Klaus, but I trust Damon a hell of a lot more than I trust you.

Klaus

And I trust no one. Which is why my sister is lying daggered in a box.