Written over 250 years ago by the Ramchal, Rabbi Moshe Chaim Luzzatto, is one of the most systematic expositions of Jewish fundamental beliefs ever written. Here the Ramchal begins with basic beliefs regarding the existence of G-d and His purpose in creation, and shows how most of the other important teachings of Judaism are a logical consequence of these concepts. In this volume, the reader has the privilege of studying the text with the help of Rabbi Yosef Begun's marginal notes. Vowelized, facing Hebrew and English texts. This edition was translated and annotated by Rabbi Aryeh Kaplan and revised by Gershon Robinson.