The Zend-Avesta, The Gathas, and the Doctrine of Zarathustra is a book written by Albert Pike that delves into the ancient Persian religion of Zoroastrianism. The book is divided into three main parts: The Zend-Avesta, The Gathas, and The Doctrine of Zarathustra. The Zend-Avesta is the holy book of Zoroastrianism and contains the religious texts and teachings of the religion. The Gathas are a collection of hymns written by the prophet Zarathustra...