Rabbi Yosef Karo author of Shulchan Aruch, was not only a learned scholar; he was also a pure and holy man to such a degree that when he studied Kabbalah he was taught by a special angel called a maggid who descended from heaven to reveal to him the innermost secrets of the Torah and to disclose the future to him.
Rabbi Yosef Karo wrote down the revelations which he heard from this angel in this book. This book contains not only Torah concepts but also exhortation, mussar. (commentary)

Translated from Aramaic into Hebrew by Rabbi Yechiel Avraham.