Talmud Eser HaSefirot is Rabbi Yehuda Ashlag’s detailed presentation of the kabbalistic teachings of Rabbi Isaac Luria, organized into 16 chapters. The work includes Ohr Penimi, a line-by-line commentary defining each kabbalistic term, and Histaklut Penimit, a broader explanation of the ideas relevant to each chapter. Each chapter is also followed by questions and answers for review, part of a structured program of detailed study that Ashlag considered essential for mastery of subtle but important kabbalistic concepts.