Book excerpt: The festive holiday of Shavuot is best known for its all-night Torah learning. The Jewish Sages teach that staying up all night is more than just a celebration of Torah, it is a tikkun, a spiritual rectification. The 16th-century mystic Rabbi Itzchak Luria, the Arizal, prepared a study guide for the night of Shavuot. This guide is presented here, in both Hebrew and English, together with a selection of penetrating insights and commentaries drawn primarily from the mystical teachings of the Zohar and the Arizal.