Yesod Yitzhak, Discourses of the Way of Kabbalah on Matters Relating to Circumcision and Studies for the Night Before the Brit, by the kabbalist Rabbi Yitzhak Isaac son of R’ Yaacov Halevi. Zulkwa, 5570 [1810]. First edition. [1] 69 leaves. 23 cm. At the end of the book is a pamphlet called Ways of the World, a collection of warnings which begin with the words: A person should always be vigilant. (See the Hebrew text for details about the author. There are important approbations at the beginning of the book. The rarest of them is the approbation of Baal Kezot HaHoshen, who rarely gave approbations. Stephanski, Hasidut 233. Old binding. A few fortifications. A few moth holes and time related stains. In good condition.