This maamor was edited and printed in honor of the birthday of the Rebbe Rashab, and it was handed out personally by the Rebbe in 770.*. It discusses deep inyonim of Chassidus, and demands attentive learning. But here, we will focus only on one point from the maamor, which is overtly relevant to the concepts of Moshiach and Geuloh found in Dvar Malchus.
The Rebbe discusses here the concept of the Divine Light (Ohr) that preceded the tzimtzum (Tzimtzum being the contraction of light by which it becomes possible to create limited, finite worlds). This Ohr that existed prior to the tzimtzum possessed two dimensions: unlimited and limited. These dimensions became the source for the two kinds of Divine revelation that exist now: Sovev (surrounding light, which cannot be grasped and thus is not revealed in the world), and Memaleh (filling light, which is limited and can this be grasped by the lower creatures).
Additionally: through the mitzvos we perform now, there will be the revelation of a new light in the time to come, an Ohr Chodosh. This Ohr Chodosh will bring about a new heavens and a new Earth (as stated by the novi Yeshaya).
The Rebbe clarifies: if we are referring to the revelation of the unlimited light that illumined before the tzimtzum (which is presently not revealed in the worlds), this is not truly new (אין זה חידוש אמיתי) — this Ohr was already revealed before the Tzimtzum, and afterwards was concealed from the world. Thus, when this Ohr will return and be revealed again, it will not truly be something new. The truly new Ohr Chodosh, which will generate a new heavens and a new Earth, is Ohr that is drawn down by our fulfilling Torah and Mitzvos now, an Ohr that didn’t exist even before the Tzimtzum!
In these words the Rebbe is giving us a small glimpse at the great significantly of the avoidah of a Yid in performing Torah and Mitzvos — it is a complete chiddush, and draws down an Ohr Chodosh that never existed previously! Here, in the oisios of Chassidus, the Rebbe is explaining the famous words of 28 Nissan (“I’ve done all that I can do, now you must do all that you can do to bring the Geuloh…”) — because it is the avoidah of a Yid, davka, to make this lowest world a “dira b’tachtonim” that draws down the Ohr Chodosh, which is the revelation of the Geuloh.
(Note that in the kuntres published for Rosh Chodesh Kislev of this year, the Rebbe will elaborate further on this subject, bringing out the point that the avoidah of the Yid is even greater than the Ohr Chodosh that comes from his avoidah!)
* Some want to suggest that perhaps the personal distribution of this maamor was (in addition to the lofty inyonim discussed in the maamor) to serve as a “distraction”, so to speak, from the amazing revelations found in the Sicha “Beis Rabbeinu sh’b’Bovel”, which was printed the same week. Well known is the principle that the first luchos were given with a big “shturem”, but had to be shattered. The final luchos, to the contrary, were brought down without lightning, thunder, and the sound of the Shofar — but they endured. In our case, Chassidim were so excited to learn a maamor that the Rebbe had handed to them personally, from his holy hand, that they didn’t have time to look closely at the other kuntres (“Beis Rabbeinu…”) that was unceremoniously dropped off in 770. (But what can a goat understand from gazing at the moon…?)