Reb Menachem Zev Halevi Gringlass wrote to an acquaintance in Tammuz 5751, referring to the sichos and maamorim of “Dvar Malchus”:
We stand now b’ezras Hashem, in the most serious period. The holy sichos and the discourses that are coming out (with the footnotes and sources) are truly revelations from Above. In truth we are not worthy of this at all, it is only by Divine Providence that we have merited to be the last generation of golus and the first of Geulah, and therefore, as the Baal Shem Tov explained on the verse “V’hu yechalkeluchoh” that Hashem Himself will make us vessels…
We must literally learn every single discourse 3-4 times at least and then think through its contents 7-10 times, at least half an hour every time, and only then maybe we can hope that something will stick, and the vessel will become a little bit clean….
source: Moshiach Weekly, expanded edition for Yud Shevat 5775, p. 18