This letter presents a sweeping, mythic biography of Zoroaster, emphasizing the extreme antiquity and legendary nature of the Magian prophet. Hall explains that “Zoroaster” is not a single historical figure but a composite title applied to several illumined teachers across millennia, much like Hermes, Vyasa, or Quetzalcoatl. Because the ancient Iranian libraries were destroyed—especially during Alexander’s conquests—only fragments of the tradition survive, producing a biography woven from symbolism, myth, and scattered historical references. Hall recounts miraculous elements of Zoroaster’s birth: immaculate conception through the sacred homa, demons fleeing at his arrival, and the infant laughing at birth. The narrative follows his early initiations, desert austerities, visions of Ahura‑Mazda and the Amesha‑Spentas, his temptation by Ahriman, and his dramatic conversion of King Vishtaspa, which established the Magian faith as Iran’s state religion. The letter concludes the life‑story with Zoroaster’s martyrdom during a Turanian invasion and the later Greek legend of his ascension in a celestial flame.

The second half of the letter outlines the vast metaphysical system of Zoroastrianism. Hall describes Zeroana Akerne—the boundless, unmanifest Principle—from which Ahura‑Mazda emerges as the manifested Logos. From this radiant Source proceed the Amesha‑Spentas, the seven creative powers who generate the seven heavens, seven worlds, and seven principles in man. Opposing them are the demonic hosts of Ahriman, forming a cosmic dualism expressed through light and darkness, spirit and matter, virtue and vice. Hall details the Persian use of astrology as a symbolic cosmology, mapping divine and adversarial forces onto the zodiac and describing the 12,000‑year world cycle culminating in restoration and dissolution. The doctrinal section emphasizes Zoroaster’s ethical core—Good Thought, Good Word, Good Deed—and the purifying fire of wisdom that dissolves ignorance. Hall closes by presenting selected maxims from the Avesta, illustrating the practical moral discipline at the heart of the Magian tradition.