Christian theologians agree that the New Testament has a single and consistent theological focus on the salvific nature of Christ, but the Hebrew Bible/Old Testament consists of several different theologies. Some of these complement each other, while others are contradictory, even within the same book.[68] Despite the lack of a single unifying theology, common themes recur, including (although no list can be exhaustive) monotheism, the divine origins of human morality, God's election of a chosen people, the idea of the coming Messiah, and the concepts of sin, faithfulness, and redemption. The study of these is central to both Jewish and Christian theologies, even if they differ in their approaches.