I couldn't really think of a FAVOURITE quote, because I love so many of them, but I picked this one simply because it just shows how much Rose loves the Doctor, and how brave she is to leave her mum behind and stay to fight alongside the Doctor even though she could die. It echoes her choices at the Game Station in the Series 1 finale, and every other time she's been there for him, when she could've run away. It's also really bittersweet, as she's forced to leave him literally about 10 minutes after that. But even then, she still fights her way across universes just toget back to him. (Forgive my rambling and bad grammar, it's late...) But yeah. Basically - brilliant quote.