Rashi's commentary on the Tanakh—and especially his commentary on the Chumash—is the essential companion for any study of the Bible among Orthodox Jews. Drawing on the breadth of Midrashic, Talmudic and Aggadic literature (including literature that is no longer extant), as well as his knowledge of Hebrew grammar and halakhah, Rashi clarifies the "simple" meaning of the text so that a bright child of five could understand it. At the same time, his commentary forms the foundation for some of the most profound legal analysis and mystical discourses that came after it. Scholars debate why Rashi chose a particular Midrash to illustrate a point, or why he used certain words and phrases and not others. Rabbi Shneur Zalman of Liadi wrote that "Rashi's commentary on Torah is the 'wine of Torah'. It opens the heart and uncovers one's essential love and fear of G-d."