[Castiel listens quietly, but there's at least the look in his face that he's listening intentionally, processing and considering every word. He waits until he's sure Wanda is done to respond.]

I don't think there's anything wrong with you, though I know you might disagree. Everyone is imperfect, even angels. We all have flaws and egos and poorly-made decisions and consequences we have to live with. That doesn't make you broken or sick, it just makes you a creature capable of independent thought. Nobody can fix that sometimes you'll choose wrong. Everyone chooses wrong.

I care about you, and I want to help you, but to the best of my knowledge, you don't need help. You're powerful and thoughtful and moral; you care about people and want to help them. You have scars from your own decisions and the decisions of others. So do I. All I can do is resolve to make better decisions in the future. That's what you need to do, too.

There's nothing more important than independence. You can change everything. You can improve yourself and those around you. You're powerful enough - and I don't mean your powers, I mean you have a force of self, a force of personality. You're a warrior. You don't wilt. Only you can fix yourself.