Likkutei Sichos, literally, "Collected Talks" (Hebrew: ליקוטי שיחות) contains both the scope and the core of the teachings of the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, and is the most authoritative source-text for Schneerson's (often novel) way of explaining Judaism and the world writ large. Rabbi Schneerson's primary vehicle for conveying his teachings were the farbrengens held on Shabbat, the festivals, and special occasions in the Chabad Lubavitch calendar, at which he would speak for many hours.