Castiel: Why must the Winchesters run toward death?
Sam Winchester: No, don't. Don't. Don't stop.
Castiel: Sam, when I was human, I died, and that showed me that life is precious, and it must be protected at all costs, even a life as... as pig-headed as a Winchester's.
Sam Winchester: My life's not worth any more than anyone else's. Not yours or Dean's... or Kevin's.
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From: Supernatural