16 Key Words. 1 Overarching Message. At the heart of the Bible is one overarching message: God saving his people through their promised Messiah. This accessible introduction to the main point of the Bible traces the development of sixteen key themes— creation, covenant, kingdom, temple, judgment, and more—from Genesis to Revelation, showing how both the Old and New Testaments come together to declare a single unified message. A concise primer to biblical theology, this book helps readers trace God's unfolding plan of redemption throughout the Bible.