Harry Potter: Snape doesn't want the Stone for himself. He wants the stone for Voldemort. With the Elixir of Life, Voldemort will be strong again. He'll come back.
Ron Weasley: But if he comes back... you don't think he'll try to... kill you, do you?
Harry Potter: I think if he'd had the chance, he might have tried to kill me tonight.
Ron Weasley: And to think, I've been worrying about my Potions final.
Hermione Granger: Hang on a minute. We're forgetting one thing. Who's the one wizard Voldemort always feared? Dumbledore. As long as Dumbledore is around, Harry, you're safe. As long as Dumbledore is around, you can't be touched.