“For example, although the Gathas of Zoroaster, about 1000 B.C., are believed to be authentic, most of the Zoroastrian scriptures were not put into writing until after the third century A.D. The most popular Parsi biography of Zoroaster was written in A.D. 1278. “The scriptures of Buddha, who lived in the sixth century B.C., were not put into writing until after the Christian era, and the first biography of Buddha was written in the first century A.D. Although we have the sayings of Muhammad, who lived from A.D. 570 to 632, in the Koran, his biography was not written until 767—more than a full
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