Likkutei Sichos (literally, "Collected Talks") contains both the scope and the core of the Lubavitcher Rebbe’s teachings, and is the most authoritative source text for the Rebbe's unique, original, and often revolutionary explanation of Judaism. The Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, is widely recognized as one of the foremost Jewish thinkers of the 20th century. His teachings include ideas in Jewish philosophy and theology, commentary on biblical, talmudical and kabbalistic texts, perspectives on world events, and moral and practical directives.