1. A Catechism 2. The Two Primeval Spirits and Creation 3. The Devil's Onslaught 4. The Necessity of Dualism 5. Man's First Parents 6. The Good Religion 7. The Good Ethics 8. Sacraments and Sacrifice 9. The Individual Judgement at Death 10. The Resurrection of the Body and Life Everlasting.

Originally published in 1956, this book provides a clear, scholarly, introduction to the main tenets of Zoroastrian dualism presented largely in the words of the Zoroastrian texts themselves.