The Rebbe praises the Mishnayos class in Montreal, encouraging its growth. He expounds on the final Mishnah in Chagigah, teaching that just as the Mizbe’ach remains pure, every Jew’s essence is holy. Through Torah and mitzvos, this inner sanctity is revealed, drawing divine blessings.
https://www.torahrecordings.com/rebbe/004_igros_kodesh/cheshvon/799