Gatha-30

Now I will proclaim to those who will hear the things that the understanding man should remember, the praises and prayer of the Good Thought to the Lord, and the joy which he shall see in the light who has remembered them well.

Hear with your ears the best things; look upon them with clear-seeing thought, for decision between the two Beliefs, each man for himself before the Great Consummation, bethinking you that it be accomplished to our pleasure.

Now the two primal Spirits, who reveal themselves in vision as Twins, are the Better and the Bad, in thought and word and action. And between these two the wise ones chose aright, the foolish not so.

And when these two Spirits came together in the beginning, they created Life and Not-Life, and that at the last Worst Existence shall be to the followers of the Lie, but the Best Existence to him that follows Right.

Of these two Spirits he that followed the Lie chose doing the worst things; the holiest Spirit chose Right, he that clothes himself with the massy heavens as a garment. So likewise they that are eager to please Ahura Mazda by dutiful actions.