More than 80 years ago, a young scholar emigrated from Eastern Europe to Jerusalem. Not long thereafter, he received a priceless spiritual teaching that revealed the source of lasting joy and fulfillment from a spiritual master whose name he would never disclose, not even after he himself became the most renowned Kabbalist of the 20th century. The young scholar's name was Rav Yehuda Ashlag, and though his letters and writings offer tantalizing hints of the wisdom that was given to him, the pieces of the puzzle have never been fully assembled until now. Here Michael Berg, himself the descendant of great Kabbalists, shares the result of years spent studying Rav Ashlag's life and work. In this book, Berg shows how the secret offers life-changing power. Drawing on stories and insights from Ashlag and other noted mystics, Berg explains how to discover one's true purpose in the world and thereby find lasting peace and joy.