The Sulam [Ladder] commentary is the most profound and elaborate commentary on The Book of Zohar, and was written by the greatest kabbalist of the 20th century, Rav Yehuda Leib HaLevi Ashlag. Zohar for All smoothly merges the original text of The Zohar with the lucid explanations of Yehuda Ashlag to create a streamlined text that is both clear and true to the source.