Avatar: The Last Airbender, Book 3: Fire

Zuko:
After I leave here today, I'm going to free Uncle Iroh from his prison, and I'm going to beg for his forgiveness. He's the one who's been a real father to me.

Ozai:
[Laughs] That's just beautiful. Maybe he can pass down to you the ways of tea and failure.

Zuko:
But I've come to an even more important decision. I'm gonna join the Avatar, and I'm going to help him defeat you.

Ozai:
Really? Since you're a full blown traitor and you want me gone, why wait? I'm powerless. You've got your swords. Why don't you just do it now?

Zuko:
Because I know my own destiny. Taking you down is the Avatar's destiny. Goodbye.

Ozai:
Coward! You may think that you're brave enough to face me, but you'll only do it during the Eclipse. If you have any real courage, you'll stick around until the sun comes out. Don't you want to hear what happened to your mother?

Zuko:
What happened that night?

Ozai:
My father, Fire Lord Azulon, had commanded me to do the unthinkable to you, my own son, and I was going to do it. Your mother found out and swore she would protect you at any cost. She knew I wanted the throne, so she proposed a plan; a plan in which I would become Fire Lord and your life would be spared. Your mother did vicious treasonous things that night. She knew the consequences and accepted them. For her treason she was banished.

Zuko:
So she's alive.

Ozai:
Perhaps.... Now I realize that banishment is far to merciful a penalty for treason. Your penalty will be far steeper.... (The eclipse ends, and Ozai strikes Zuko with lightning, only for Zuko to direct it back to him, knocking Ozai off his feet)