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.