last canonical book of the Old Testament and before Christianity and the composition of the New Testament. This covers an era between about 150 BCE to 100 CE. These Jewish inter-testamental writings describe a complicated hierarchy of angelic beings, in an echo of the Zoroastrian concept of the holy court of the Yazatas. The Jewish idea of seven chief archangels probably has its inspiration in the seven Amesha Spentas, the highest guardian spirits of Zoroastrian belief. Jews had their own ideas of angels long before they encountered Zoroastrianism; angels were nameless, impersonal representatives of God's message and action. But after the Exile, Jewish angels gain names and personalities, and also are spoken of as guardians of various natural phenomena, just like the Zoroastrian yazatas. The Jewish and Christian idea of a personal "guardian angel" may also have been inspired by the Zoroastrian figure of the fravashi, the divine guardian-spirit of each individual human being. Zoroastrian influence on Judaism is also evident in the evolution of Jewish ideas about good, evil, and the End of Time. The original statement of the famous Zoroastrian dualism of good and evil is found in the Gathas, where Zarathushtra describes the two conflicting principles of good and evil in what might be called psychological, or ethical terms. Human beings are faced with the existence of good and evil within themselves - he describes these principles as the "beneficent" and the "hostile" spirits - and everyone must make the choice for Good in order to follow God's will. However, by the Hellenistic era, Zoroastrianism had already developed its doctrine of "cosmic dualism" - the idea that the entire Universe is a battlefield between the One Good God, Ahura Mazda, and the separate Spirit of Evil, Ahriman. This view of dualism is a symbolic transformation, and an expansion, of the more psychologically based teaching of Zarathushtra that good and evil are ethical...
