This book is a textual and theological analysis of the interaction between the sin and faithlessness of Israel and the grace of Yahweh in response looking especially at Deuteronomy chapters 13 810 and 2930. The author argues that the grace of Yahweh is determinative for the ongoing relationship between Yahweh and Israel and that Deuteronomy anticipates and fully expects Israel to be faithless. Does the Old Testament have an optimistic outlook for the people of God ancient Israel or is it pessimistic The strands of optimism and pessimism seem to be juxtaposed throughout. In this study of Deuteronomy a lynchpin book within the Old Testament the socalled tensions between optimism and pessimism are slow to cohere theologically. Despite the faithlessness of Israel Yahweh's faithfulness to his promises results in the triumph of grace.