

* The decision must not be made for himself. Aang needed to know what to do when he faced Ozai. They are giving him valuable lessons on how to be an effective and selfless Avatar. In summary, none of the Avatars tell Aang exactly what to do, or even that he has to kill anyone. Up until now, Aang has never thought of the need to separate righteousness from responsibility. For Aang to concern himself with his personal convictions is to put himself before his duty.
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It is the inherent duty to of the Avatar to serve the people of the world first and foremost by any means necessary, and to put oneself in harm's way if need be. Yangchen's advice culminates in telling Aang that he cannot let his personal biases affect any of the aforementioned factors in his decision. Here is my wisdom for you: Selfless duty calls you to sacrifice your own spiritual needs, and do whatever it takes to protect the world. Many great and wise Air Nomads have detached themselves and achieved spiritual enlightenment, but the Avatar can never do it. In the same way that Iroh says "the only way for this war to end peacefully is for the Avatar to defeat the fire lord," this must also apply to his determination. He can't let any other people solve his problems for him. What Kuruk is basically saying is that whatever decision is made, it has to be Aang's decision. Aang, you must actively shape your own destiny and the destiny of the world. If I had been more attentive and more active, I could've saved her. He needs to end him, totally and in a way that holds him entirely accountable for his actions at the mercy of all who he has wronged. Aang can't merely interrupt Ozai's plans and ultimately forgive him. "Stop" means something very different to Kyoshi it is justice. Aang can't just "stop" Ozai in the loose sense. Now that Aang has been advised by Roku on how he should make his decision, Kyoshi tells him what the severity of his decision should be. I offer you this wisdom, Aang: Only justice will bring peace. I would have done whatever it took to stop Chin. What Roku is saying here can be summed up in the fact that Aang cannot leave this conflict open-ended like Roku did with Sozin. I offer you this wisdom, Aang: You must be decisive. If I had been more decisive and acted sooner, I could have stopped Sozin and stopped the war before it started. For the purposes of storytelling their advice is cumulative, much like the Avatars themselves. Maybe this is obvious to some people, but I thought it would be interesting to take a closer look at what exactly the past avatars meant when advising Aang on how to stop Fire Lord Ozai.
