Avi Sagi's book ponders one of the most intriguing shifts in modern Jewish thought: from a metaphysical and theological stand-point toward a new manner of philosophising based primarily on practice. Different chapters study this great shift and its various manifestations. The central figure of this new examination is Isaiah Leibowitz, whose thoughts encapsulate more than any other Jewish thinker this stance of religion without metaphysics. Sagi explores corresponding issues such as observance, the possibility of pluralism, the meaning of penance without messianic suppositions, and pragmatic coping with theodicy after the Holocaust, presenting the different possibilities within this great alteration in Jewish thought.