Uncle Iroh: [Draws Fire symbol in the dirt] Fire is the element of power. The people of the Fire Nation have desire and will and the energy and drive to achieve what they want.
Uncle Iroh: [Draws Earth symbol] Earth is the element of substance. The people of the Earth Kingdom are diverse and strong. They are persistent and enduring.
Uncle Iroh: [Draws Air symbol] Air is the element of freedom. The Air Nomads detached themselves from worldly concerns and found peace and freedom. Also, they apparently had pretty good senses of humor.
Uncle Iroh: [Draws Water symbol] Water is the element of change. The people of the Water Tribes are capable of adapting to many things. They have a sense of community and love that holds them together through anything.
Prince Zuko: Why are you telling me these things?
Uncle Iroh: [Draws straight lines separating the four symbols] It is important to draw wisdom from many different places. If you take it from only one place, it become rigid and stale.
Uncle Iroh: [Draws a circle around all four symbols] Understanding others, the other elements, and the other nations, will help you become whole.
Prince Zuko: All this four elements talk is sounding like Avatar stuff.
Uncle Iroh: It is the combination of the four elements in one person that makes the Avatar so powerful. But it can make you more powerful, too.