What Is the Theme and Purpose of the Book of Joshua?

For OT theologians who view the center of their theology as promise/ fulfillment, this book represents the fulfillment of centuries of prophetic promise and historical movement. Thus the narrative has a twofold emphasis: the destruction of an idolatrous people and the progress and victory of faith in the one true God. The theme is “the venture and victory of faith.” As an historical account, the book of Joshua demonstrates the faithfulness of God, despite the inconsistent nature of the faith of God’s people. It shows Him as the covenant-keeping God (Jos 1:26). The purpose is to strengthen faith in and commitment to the Lord by giving a history of the conquest of Canaan and the distribution of the land among the tribes.