Explanations and Sources for Orot Hateshuva / Rabbi Yaakov Halevi Filber. The book 'Explanations and Sources for the Lights of Repentance' by Rabbi Yaakov Halevi Filber is a key and foundational book for understanding Rabbi Kook's Mishnah of Repentance. In the book before us, the reader will find a profound explanation, on the one hand, and simple to understand, on the other hand, for the book Orot HaTshuva. The entire book is fully punctuated and in eye-catching type. Fourth expanded edition. 256 pp.