The two represent the duality only and only in the human mind and within the human society. The dualism in the Gathas is pure ethical in nature. The Gathas advocate a free, peaceful, prudent, and progressive society, both in spirit and matter. It makes them conceive God. It promotes them to commune with God, and be godlike.
Materiality makes people understand their social environment and the living world.
It teaches them the philosophy of living and letting others live, and of living in harmony with nature. Only responsible men and women make the Gathic society. Carefree and parasitic people have no place in it. A person, be he or she wise, naive, strong, or weak, has his or her responsibilities in the society. Zarathushtra stands for freedom of thought, word and deed, and stands against suppression and exploitation.