system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA/LOK] When Iroh said you had to have "peace of mind" to generate lightning, what does that actually mean?

As seen in the first series, Zuko was unable to generate lightning due to his inner turmoil. Yet at the finale of the series, Azula was able to generate lightning despite having a mental breakdown? In the comic The Search, Azula was clinically insane yet was still able to generate lightning multiple times. 

Do you have to have inner peace to generate lightning or are there other ways to do it that Iroh didn't know about?
gpt
Azula may be crazy, but she knows who she is. She's a finely turned weapon producing lighting as a way to exert her own power over others. Conversely, Zuko has been relentlessly pursuing the agendas of others, forwarding other goals, and seeking approval he does not need.  Zuko struggles, Azula succeeds.