Avatar: The Last Airbender, Season 1

[Aang attempts to convince Jeong Jeong to teach him firebending]

Aang:
Master, I need to learn firebending.

Jeong Jeong:
Only a fool seeks his own destruction.

Aang:
[sits down] I'm the Avatar. It's my destiny to— [Jeong Jeong cuts off Aang's sentence]

Jeong Jeong:
Destiny? What would a boy know of destiny?! If a fish lives its whole life in this river, does he know the river's destiny? No! Only that it runs on and on out of his control. He may follow where it flows, but he cannot see the end. He cannot imagine the ocean.

Aang:
[feels unsure] Okay... But it's the Avatar's duty to master all of the bending disciplines.

Jeong Jeong:
To master the bending disciplines, you must first master discipline itself. But you have no interest in this, so I have no interest in you. Now, get out.

Aang:
Please, I have to learn. This could be my only chance. [Jeong Jeong lashes back at Aang]

Jeong Jeong:
Are you deaf?! How can I teach you if you refuse to listen?! Before learning firebending, you must learn water and earth. Water is cool and soothing. Earth is steady and stable. But fire... fire is alive. It breathes, it grows. Without the bender, a rock will not throw itself! But fire will spread and destroy everything in its path if one does not have the will to control it! That is its destiny! You are not ready! You are too weak!

[the candles suddenly burn out and relight to show Avatar Roku standing before Jeong Jeong]

Roku:
You think I am weak?

Jeong Jeong:
Avatar Roku! No, no! [bowing his head in respect] I did not mean that!

Roku:
I have mastered the elements a thousand times in a thousand lifetimes. Now, I must do it once again. You will teach the Avatar firebending.

Jeong Jeong:
[coming out of his vision] Yes, yes... I will teach you.

Aang:
Really? That's great!