Zoroastrianism might be a fast-declining religion in today’s world, but what is remarkable is its eternal enigma. It is hard to believe that the hymns of the faith have travelled down to us in accurate form and poetic metre, purely through the memory of generations of priests. Zarathustra, the founder of the faith, belonged to a period of Persian history which antedated the Achaemenid dynasty (from 550 BC to 330 BC). He followed the old Rigvedic religion ...