Impossible! You can't know me better than myself... you can't. [But he sounds merely like a desperate man trying to convince himself of this matter. Unfortunately, he's not doing a very good job of that. There's so much he's repressed, even repressed from himself that her words ring all too true.] Doing good deeds surely must make me a good person... or intending to ultimately do good... Cosmos would not have called me if I were truly evil.

[But, again, there's a tone of desperation there. He has to believe that her words aren't right about him, that she doesn't know all of the hideous secrets he'd rather keep hidden from the world.]

I'm not dead! Not anymore... I know what you've told me but at least... at least I'm not physically dead... My heart beats, my breath stirs and my flesh is warm... I'm far from a zombie.

[He's still not sure that's enough, though, and she's done plenty to convince him that some part of him never truly left the grave... some part of his soul, his essence is dead and gone for good.]