A new paradigm for relations between religions, one of acceptance and collaboration, requires not only a willingness to move beyond a tradition of hostility and competition but also significant theological rethinking. Within Jewish Orthodoxy there have been very few voices that have advanced and justified a vision of other faiths in this light: to this day, the reigning paradigm is one of practical collaboration while avoiding theologically based engagement or reflection. Two of the most important Orthodox Jewish voices advocating change have been those of Irving Yitz Greenberg and Jonathan Sacks. This book presents the theological, moral, and social views of these two leading rabbis. It focuses on the significance of covenant for both, and how they adapt this concept to enable the development of a Jewish view of other religions. In considering how they may have influenced each other, it also studies the limitations and internal contradictions that characterize their work as they attempt to point the way forward, in a spirit of dialogue, to continuing theological reflection on Judaism’s approach to world religions.