Zarathustra started to preach that there was a "wise lord" who had created the world, mankind and all good things in it through holy spirit,
The rest of the universe was created by six immortals. And that the universe is a cosmic struggle between "truth" and "lie". He introduced the concepts of creation, existence and Free Will.
The purpose of humankind, like that of all other creation, is to sustain this struggle or balance between the true and the lie. For humankind, this occurs through active participation in life and the exercise of good thoughts, words and deeds.
So, what does this mean?
Okay, this one is going to be mystical in nature, but that’s Zarathustra for you... Arkangel Zarathustra introduces the notion/possibility that there is illusion all about. This illusion is generated by the great struggle between the polarities (truth/lie). Being in this vibrational consciousness introduces higher definitions of discernment for you to participate with in filtering out this seemingly eternal conflict.
For it too is an illusion.