Learning Torah can be an act of service when we give to the material rather than receive from it. Our usual approach when learning is to try gain information, gain knowledge. What does an approach of giving when studying mean?
The Master of the Ladder "The Life and Teachings of Rabbi Yehudah Leib Ashlag by Rabbi Avraham Mordecai Gottleib. Translated and Edited by Yedidah Cohen
A Tapestry for the Soul: The Introduction to the Zohar by Rabbi Yehudah Lev Ashlag with explanatory excerpts collated from his other writings by Yedidah Cohen
In the Shadow of the Ladder: The Introductions to the Kabbalah by Rabbi Yehudah Lev Ashlag, with explanatory chapters translated from the Hebrew by Mark and Yedidah Cohen