Zuko: So uncle, I’ve been thinking. It’s only a matter of time before I run into Azula again. I’m going to need to know more advanced firebending if I want to stand a chance against her. I know what you’re going to say: she’s my sister and I should be trying to get along with her.
You probably think I deserve this, don’t you? Look, I’m sorry I hunted you, but that’s just the natural order of things! Big things eat smaller things, nothing personal. But this time it didn’t work out that way.
You must never give in to despair. Allow yourself to slip down that road and you surrender to your lowest instincts. In the darkest times, hope is something you give yourself. That is the meaning of inner strength.