Ancient Iranian religion was strongly connected. Beginning in the early 10th-century BC, the ancient Iranian religion was gradually displaced by Zoroastrianism, which contains many essential aspects of its predecessor. The sources on ancient Iranian religion, though limited, consist of textual and material sources. The textual sources are both Iranian and non-Iranian. An important Iranian source is the Avesta, which are Zoroastrian sacred scriptures made in the Avestan. This is considered the principal source of knowledge on ancient Iranian religions. It is a collection of several texts that seems to have been over a large span of time by a variety of authors. These
The Good Book (book) like the influence of the Bible...no". Writing in First Things, R.J. Snell notes that Grayling's book, which draws its form and arrangement from religious authors, ignores the actual writings of religious authors: "A collection including Virgil but not Dante, Cicero but not Augustine, Aristotle but not Maimonides, Livy but not Boethius, Kant but not Kierkegaard, and Goethe but not Dostoyevsky is a truncated selection, especially when the standard for exclusion is some supposed taint by religion." Grayling discussed "The Good Book" with the Archbishop of Canterbury, Rowan Williams, before a large audience on London's South Bank, and with Richard Holloway,