This text is a definitive introduction, explanation and commentary upon the Tanya, one of the greatest books of moral teaching of all times, which was written by the Chassidic master Rabbi Schneur Zalman at the beginning of the 19th century. Rabbi Adin Steinsaltz has written an illuminating introduction to the Tanya, including both overviews of its broad philosophical and spiritual messages as well as point-by-point commentary on the text itself.