The Rav explained that within Chassidus (the revelations of the Baal Shem Tov, which started to reveal Radl”a, the unknowable head), there were two branching revelations: The teachings of Chabad, which are the Chochmah of Radl”a, and the teachings of Breslev, which are the Binah of Radl”a. Is there any path today which is the Keser of Radl”a?
The path of Keser d’Radl”a is the light of Mashiach which is shining increasingly stronger the closer we get to Mashiach. It is when all paths will be gathered together, and that will be the container that will begin to hold the light of Mashiach, and this will enable a new path to be revealed, which will be the light of Mashiach. It is the absolute level of p’shitus. There are 3 levels: (1) Complexity. (2) Complexity that is drawn from p’shitus/simplicity, where wisdom is drawn from ayin. (3) P’shitus itself. This light is slowly being shined into the world and it is also being shined within people’s souls. This is the light of Mashiach will can precede Mashiach’s arrival because it does not depend on the physical appearance of Mashiach. At the Geulah, the revelations will be complete and then Mashiach’s body will be revealed as well to the world, but we are not dealing with this [in these shiurim].
[Editor's Note: Resha D’Lo Ityada–Radla“The Unknowable Head” (as explained by Rav Yitzhak Ginsburgh, Shlit"a)
In the Zohar, the full phrase for “the Unknowable Head” is “the Head which neither knows nor is known.” This implies that this level of keter is neither conscious of its own inner being nor is known to any consciousness outside of itself.
In Kabbalah and Chassidut it is explained that this level, the highest of the three supreme “heads” of the keter of Atzilut, is the source of the soul of Mashiach. Initially, before being coronated as King of Israel, the Mashiach neither knows of his own inner potential nor is recognized publicly.
The level of Radla includes the three higher sefirot (keter, chochmah, binah) of the partzuf Atik Yomin, the inner partzuf of keter. Whereas the lower seven sefirot of the partzuf Atik Yomin are “enclothed” within the partzuf Arich Anpin (as a soul within a body), the three higher sefirot of Radla are not “enclothed” within any subsequent level of partzuf whatsoever. For this reason, Radla is referred to as “the Revealed Head,” not because it is revealed in consciousness, but because it is inherently in no way “concealed” or “covered” by any other reality.
In the soul of Israel, the Radla is the origin of each and every Jew’s pure and simple faith in God. In the innate faith if Israel inheres a deep existential sense of the infinite pleasure of the world to come. This explains why Radla is the head of Atik Yomin, the inner partzuf of keter, which, in general, corresponds to the superconscious pleasure of the soul.]