Avatar: The Last Airbender, Book 2: Earth

Katara:
Can we talk about something?

Aang:
Sure.

Katara:
Do you remember when we were at the Air Temple and you found Monk Gyatso's skeleton? It must have been so horrible and traumatic for you. I saw you get so upset that you weren't even you anymore. I'm not saying the Avatar State doesn't have incredible- and helpful- power, but, you have to understand, for the people who love you, watching you be in that much rage and pain is really scary.

Aang:
I'm really glad you told me that. But I still need to do this.

Katara:
I don't understand.

Aang:
No, you don't. Every day, more and more people die. I'm already a hundred years late. Defeating the Firelord is the only way to stop this war! I have to try it.

Katara:
I can't watch you do this to yourself. I'm not coming tomorrow. Good night.

Aang:
Good night.