Pass wisdom and virtues of humility and patience. Pass down your experience and ability so that the next generation (not just your own children) can build a better world for themselves. Stand as a bastion of emotional calm, while showing that you understand how to deal with your grief and anger in healthy ways. And use the consequences of your past abuses of these virtues to warn the next generation to not do the same.

This is exactly who Iroh was.

Iroh isn't a man. He's the man