Vos handles this under three main divisions: the Mosaic epoch of revelation, the prophetic epoch of revelation, and the New Testament. Such an historical approach is not meant to supplant the work of the systematic theologian; nevertheless, the Christian gospel is inextricably bound up with history, and the biblical theologian thus seeks to highlight the uniqueness of each biblical document in that succession. The rich variety of Scripture is discovered anew as the progressive development of biblical themes is explicated.