"Zoroastrianism is the oldest of the revealed world-religions, and it has probably had more influence on mankind, directly and indirectly, than any other single faith." - Mary Boyce, Zoroastrians: Their Religious Beliefs and Practices (London: Routledge and Kegan Paul, 1979, p. 1)
"Zoroaster was thus the first to teach the doctrines of an individual judgment, Heaven and Hell, the future resurrection of the body, the general Last Judgment, and life everlasting for the reunited soul and body. These doctrines were to become familiar articles of faith to much of mankind, through borrowings by Judaism, Christianity and Islam; yet it is in Zoroastrianism itself that they have their fullest logical coherence....” - Mary Boyce, Op. Cit. p. 29.