This book is in a category of its own. It is the authoritative handbook of Jewish meditation. This invaluable technique was nearly lost in the holocaust of European Jewry, but R' Sterne has brought it back from the edge of extinction by translating this seminal work from the Chasidic master, the Rebbe Rashab of Lubavitch (1860-1920). Features a full English translation, many diagrams and tables to clarify spiritual levels, a full commentary bringing the esoteric material closer to our modern consciousness, and three appendices with extensive scholarly notes. A must for the serious Jewish English library, now for the first time available in softback format. The third edition includes an appendix of the classes of the mashpia ("mentor/teacher"), R' Chaim Shalom Deitsch שיח' who taught the text in the old city of Jerusalem.