This book deals primarily with the problem of the one and the many. The problems of creation, of evil, of revelation, and of ethics are all treated as special cases of the general problem of relating the finite to the infinite, the many to the one. The authors focus on the unifying theme of mediation, the means by which the Absolute relates to the here and now. The principal figures studied include Philo, Plotinus, Iamblichus, Isaac Israeli, Avicenna, Ibn Gabirol, Al-Ghazali, Abraham Ibn Daud, Maimonides, Averroes, Albertus Magnus, Aquinas, Gersonides, Nahmanides, Ibn Falaquera, Narboni, Albalag, Leone Ebreo (Judah Abarbanel), and Spinoza, as well as such Kabbalistic thinkers as Bahir, Cordovero, Luria, Moses de Leon, Ya'akov ben Sheshet, Isaac the Blind, Menahem Renanti, Shem Tov ben Shem Tov, Azriel of Gerona, Alemanno, Luzzato, Cordovero, and Abraham Herrera.