Deuteronomy is written similarly to the vassal-treaties formulated between captor and captive nations prior to 1000 B.C. It contains historical information, enumerates laws, and concludes with threats and promises (Hebrew Greek Key Study Bible, from the Introduction to Deuteronomy). From a general survey of Deuteronomy, it is sufficiently evident that the exposition of the commandments, statutes, and rights of the law had no other object than this: to pledge the nation in the most solemn manner to an inviolable observance, in the land of Canaan, of the covenant, which YHVH had made with Israel at Horeb (Deut 28:29, Keil and Delitzsch Commentary of the Old Testament, from the introductory note to Deut).

In Deuteronomy, Moses speaks like a dying father giving a farewell song to his children all the while he celebrates Elohim as the spiritual Rock of Israel. While the eyes of the Israelites may have fixated too much upon Moses their physical leader (instead of Elohim) for forty years, Moses now attempts to redirect their eyes, trust and allegiance heavenward and onto YHVH, their real spiritual Leader who had been behind Moses—a mere human leader—all the time. 

The words of Deuteronomy are earnest, inspired, impressive. He looks back over the whole of the forty years of their wandering in the desert, reminds the people of all the blessing they had received, of the ingratitude with which they have so often repaid Elohim, and of the grace, mercy, love and judgments of Elohim. Furthermore, Moses explains the laws of Torah again and again, and adds to the Torah some 70 new laws, which were necessary to complete it. He never wearies of urging obedience to the Torah in the warmest and most emphatic words, because the very life of the nation was bound up with this; he surveys all the storms and conflicts that they passed through, and, beholding the future in the past, takes a survey also of the future history of the nation, and sees, with mingled sorrow and joy, how the three great features of the past—that is to say, apostasy, punishment, and pardon—continue to repeat themselves in the future also. (Keil and Delitzsch, from the introductory note to Deut) Deuteronomy is a unique book—distinct from the narrative and historical, the legal, prophetic, and devotional writings of the Scriptures, though it has affinities with each of them. In its literary aspect, it is oratory; and as such it is unsurpassed in its rush of rhythmic sentences, its ebb and flow of exalted passion, its accents of appeal and denunciation: Moses’ speech shines as well as his face. And this noble language gives utterance to truths which are always and everywhere sovereign—that Elohim is one, and that man must be wholly his; that Elohim is righteous and faithful, mercy and love. The Elohim proclaimed in Deuteronomy stands in relation to Israel and humanity not merely as Judge or Ruler, but as Friend and Father. “And thou shalt love YHVH your Elohim with all thy heart, and with all thy soul, and with all thy might.” This whole-souled love and devotion to Elohim is to be accompanied by a large-hearted benevolence towards man, and indeed towards all sentient beings; by the recognition of the retributive righteousness of El; and by the insistence on the vital importance of family life, and of religious instruction within the home. The influence of the Book of the Farewell Discourses of Moses on both domestic and personal religion in Israel throughout the millennia has never been exceeded by that of any other book in Scripture. (Soncino Edition of the Pentateuch and Haftorahs, from the introductory note to Deut) Moses was the first to prophecy the coming of the Messiah (Deut 18:15), and Moses is the only person to which Yeshua compared himself (John 5:46–47).

Yeshua often quoted from Deuteronomy. When asked what was the most important commandment in the Torah he quoted Deuteronomy 6:5 and included this verse as part of his summation of the whole Torah. In his temptation in the wilderness, he quoted exclusively from Deuteronomy when resisting the devil (Deut 8:3; 6:16; 6:13; 10:20).

Deuteronomy teaches more of the heart and spirit of the Torah, and that the relation of Elohim to his people encompasses much more than just a legalistic observance of the Torah. Israel’s covenant relationship with Elohim involves obedience and loyalty as well as love, affection and devotion, which should be the true foundation of all of our action. Success, victory, prosperity and happiness all depend upon our obedience to YHVH. The book is a must-read for an understanding of man’s obedience to Elohim based on love and fear (Deut 10:12,13, Spirit Filled Life Bible, from the introductory note to Deut).

In a sense, Deuteronomy is not only a synopsis, but a commentary on the first four books of the Torah. This book along with the Epistle to the Hebrews contain the best comment on the nature, design, and use of the Torah. (Adam Clarke’s Commentary on Deuteronomy, from the introductory note to Deut)

The Book of Deuteronomy contains not so much a recapitulation of the things commanded and done as related in Exodus, Leviticus and Numbers, as it is a compendium and summary of the whole law and wisdom of the people of Israel, wherein those things that related to the priests and Levites are omitted, and only such things are included as the people are generally required to know. Much more than being a repetition of what preceded it, Deuteronomy is an oratory, description, explanation, and enforcement of the most essential contents of the covenant revelation and covenant laws, with emphatic prominence given to the spiritual principle of the law and its fulfilment, and with a further development of the ecclesiastical, judicial, political, and civil organization, which was intended as a permanent foundation for the life and well-being of the people of Israel in the Promised Land of Canaan. There is not the slightest trace throughout the whole book of any intention whatever to give a new or second law. (Keil and Delitzsch, from the introductory note to Deut)