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[That's not what Dean wants to hear, but it stops him cold. Because he's heard that before. That's what his Cas told him after he finally showed up and shoved his hand so far into Sam he should have been paying for dinner.]
I didn't listen to that bullshit before and I'm not now. There has to be some way that Sam can get his soul back and not end up a vegetable. If you can believe that I'll find the cure, why the hell can't you believe that?