Traditionally ascribed to Moses, modern scholarship sees its initial composition as a product of the Babylonian exile (6th century BCE), with final revisions in the Persian post-exilic period (5th century BCE). Carol Meyers, in her commentary on Exodus, suggests that it is arguably the most important book in the Bible, as it presents the defining features of Israel's identity: memories of a past marked by hardship and escape, a binding covenant with God, who chooses Israel, and the establishment of the life of the community and the guidelines for sustaining it. Everything is presented as the work of God, who appears frequently in person. It is not a historical narrative in any modern sense, instead its primary concern is theological. It reflects common themes of past communities in exile, including facing foreign captivity and suffering under just judgment because of disloyalty to God. There is no historical evidence for the Exodus story as written.