The air is what frees us...

Aang had been their savior. He had been a savior to his friends, to their families, and to the rest of the world. Why? Because he saved them from evil and gave them freedom. Yes, once Lord Ozai had been destroyed, the world was once again free. Free because of Aang.

The earth is what feeds us...

Sokka loved to eat. Fruits, vegetables, and especially meat, he'll eat anything, just name it. So it was very helpful when Toph used her earthbending to cause fruits from the trees to fall. And Sokka decided that he liked the blind girl a little more.

The moon is what guides us...

Whenever Katara couldn't sleep, she'd sneak out of their camp to find a clearing, where she'd gaze up at the stars and especially the moon. She loved the moon for she remembered that is was Yue now watching over them. She thanked Yue, for guiding them through where ever. For unexpectedly in the darkness, the moon's light had shone down directly on two particular golden eyes. And years later, she thanked her for guiding her to those eyes of her true love.

The sun is what finds us...

Zuko hated to 'rise with the sun'. He'd wished to sleep longer, but occasionally when he tried, he'd fail. So he slowly opened his eyes just as the sun's rays had already shone. But he didn't get up so fast, for he stayed and admired the figure that lay on top him. Now he remembered why rising with the sun was worth it. Because he'd get to see his lovely wife looking ever so serene and peaceful. Yes, the sun opened his eyes to find beauty. Beauty in a waterbender.