The Old Testament offers a rich palette of ideas, images, and narratives that help us unpack some of the more compact and opaque theological ideas of the New Testament. In conversation with both Christian and Jewish interpreters, prominent scholar Gary Anderson explores the exegetical background of key Christian doctrines. Through a deeper reading of our two-Testament Bible, he illustrates that Christian doctrines have an organic connection to biblical texts and that doctrine can clarify meanings in the text that are foreign to modern, Western readers. Anderson traces the development of doctrine through the history of interpretation, discussing controversial topics such as the fall of man, creation out of nothing, the treasury of merit, and the veneration of Mary along the way. He demonstrates that church doctrines are more clearly grounded in Scripture than modern biblical scholarship has often supposed and that the Bible can define and elaborate the content of these doctrines.