The greatest Kabbalist of the 20th century, Rav Yehuda Leib Halevi Ashlag, who wrote the Sulam (Ladder) commentary on The Book of Zohar, had very few students. A prolific writer, he spent almost all of his time at his desk, so the students that he did have were precious. When spending time away from home and from his students, Rav Yehuda Ashlag would write elaborate letters to provide them with guidance and encouragement. Today these letters offer a window into the special relationships cultivated between the great teacher and his devoted students.