Avatar: The Last Airbender, Book 3: Fire

Zuko:
Sokka told me the story of what happened. I know who did it, and I know how to find him.

Aang:
Umm and what exactly do you think this will accomplish?

Katara:
(shakes her head and lets out a laughing breath) I knew you wouldn't understand.

Aang:
Wait, stop! I do understand! You're feeling unbelievable pain and rage! How do you think I felt about the sandbenders when they stole Appa? How do you think I felt about the Fire Nation after I found out what happened to my people?!

Zuko:
She needs this, Aang. This is about getting closure and justice.

Aang:
I don't think so. I think it's about getting revenge.

Katara:
Fine! Maybe it is! Maybe that's what I need! Maybe that's what he deserves.

Aang:
Katara, you sound like Jet.

Katara:
It's not the same. Jet attacked the innocent. This man...he's a monster.

Sokka:
Katara, she was my mother too, but I think Aang might be right.

Katara:
Then you didn't love her the way I did!

Sokka:
(with hurt showing on his face and in his voice) Katara!

Aang:
The monks used to say that revenge is like a two headed rat viper; while you watch your enemy go down, you're being poisoned yourself.

Zuko:
That's cute. But this isn't Air Temple preschool! It's the real world.

Katara:
Now that I know he's out there, now that I know that we could find him, I feel like I have no choice.

Aang:
Katara, you do have a choice. Forgiveness.

Zuko:
That's the same as doing nothing!

Aang:
No it's not. It's easy to do nothing, but it's hard to forgive.

Katara:
It's not just hard. It's impossible.