Now available in this Hebrew-English edition for the first time, this book, authored by the Holy Rabbi Dov Ber of Lubavitch, is known as THE KEY to Kabbalah and Chassidus, and it's mastery is a prerequisite for all students of Kabbalistic and Chassidic thought and methodology. This is because it bring absolute clarity to the entire methodology of Kabbalah and the process of creation known as the chaining down of the worlds. It is therefore the foundation to unlocking the secrets of Kabbalah and the treasure troves of Chassidus. It is a must read for any serious minded seeker of God's Truth.