I'm still not sure I understand the difference between "Great Being" and "Great Spirit."

In the time before time, on the mythical island of Mata Nui...

The Super Spirit descended from the heavens, carrying we, the ones called Matoran, to this island paradise. Then, the Super Spirit gave us the three virtues. Unity, Duty, and Destiny. In return, we named the island after him, and his protection.

Then came a time of awesome prosperity, and all was well. Until the Super Spirit's jealous brother arrived, ending the golden age of our lives and casting his brother into the deepest of slumbers.

Darkness covered the land, and just when all hope seemed lost, six heroes washed ashore. The prophesied Toa! With their Toa Tools and their Radical Masks of Power, they will stand up to the darkness and vanquish evil!