The gemara states that the book of Devarim represents the words of Moshe. Its distinctive feature is that it repeats certain elements from prior books while introducing new ones, adding depth to the learning experience. Unlike the other books, Devarim is called 'Mishneh Torah' because it serves as both a review and an independent entity within Torah study.
Devarim is unique in that it encapsulates Moshe’s personal teachings, rendering it a mix of repetition and novel insights. For instance, several mitzvot are reiterated with expanded interpretations or additional commentary that Moshe shares with Bnei Yisroel before entering Eretz Yisroel.
The Rebbe outlines how this reflects not merely a repetition but a refinement of understanding. This elevated message encourages engagement not only for historical remembrance but as an active, dynamic component of Torah study.
While viewing Sefer Devarim through this lens, it's evident that its significance lies also in bridging prior knowledge with new commandments exclusive to this book. Through such a study approach, one's comprehension reaches beyond surface-level recollection to grasp deeper spiritual nuances.