Fire is an unwieldy element. Probably one of the most difficult and painful elements to learn. As a firebender it’s easy and natural to shoot fire, but to bend fire requires a complex set of understandings about oneself, the nature of fire, and the nature of life.
Aang: Master, I need to learn firebending.
Jeong Jeong: Only a fool seeks his own destruction.
Aang: I'm the Avatar, it's my destiny to—
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: 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: 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!
Jeong Jeong: I had a pupil once who had no interest in learning discipline. He was only concerned with the power of fire - how he could use it to destroy his opponents and wipe out the obstacles in his path, but fire is a horrible burden to bear. Its nature is to consume and without control it destroys everything around it. Learn restraint, or risk destroying yourself and everything you love.
Jeong Jeong: Water brings healing and life. But fire brings only destruction and pain. It forces those of us burdened with its care to walk a razor's edge between humanity and savagery. Eventually, we are torn apart.