The Vampire Diaries, Season 4

Stefan:
(about the final remaining white oak stake) Damon give that to you?

Elena:
Yes. Reluctantly. Stefan, she's-- she's not going to stop. She's just going to keep pushing and pushing.

Stefan:
Well if you want to kill her, I'm not going to stop you. But see, here's what will happen. It will feel really good for about ten seconds. And then after that, tens of thousands of vampires all over the world will start to die. Every vampire she ever turned will die. See, rage is a really powerful feeling. But guilt... take it from me. It will destroy you. So. You can either go after her or you can get on the back of my motorcycle. And we can get the hell out of here.