Avesta as "Fragments Tahmuras"; and the "Hadokht Nask" "volume of the scriptures" with two fragments of eschatological significance. Only texts preserved in the Avestan language count as scripture and are part of the Avesta. Several other secondary works are nonetheless crucial to Zoroastrian theology and scholarship. The most notable among the Middle Persian texts are the "Dēnkard" ("Acts of Religion"), dating from the ninth century; the "Bundahishn" ("Primordial Creation"), finished in the eleventh or twelfth century, but containing older material; the "Mainog-i-Khirad" ("Spirit of Wisdom"), a religious conference on questions of faith; and the "Book of Arda Viraf", which is especially
Phenomenology of religion the authentic sources: writings and images by the believers themselves. This procedure compelled him to reduce the field of his research - he had to profoundly master all relating languages and writings in order to be able to understand his sources in a way as they would have wanted to be understood themselves. Consequently, he reduced his field of research to the phenomena in religions living around the origin of Christianity: during the millennia before and the centuries after Christ, in Iran (Avesta), Babylonia and Assyria, Israel, Egypt, Greece and Rome. The required knowledge of speeches, also, is one of