We have just begun reading the book of Deuteronomy in our annual Bible reading plan. This final book by Moses is written as a second giving of the Law (the word “Deuteronomy” means “second law”). So it is a book of reminders. As such, it summarizes the previous books of the Pentateuch. It reminds the nation of Israel where they have been, and how far God has brought them since they departed from the land of Egypt. It reminds them of their duty to love, fear, and obey God; and most importantly, it is a reiteration of the Sinai Covenant, and reminds the new generation which did not directly receive the covenant what their relationship is towards God.
Read more about the themes and importance of the book of Deuteronomy here.