How did medieval Jewish scholars, from Saadia Gaon to Yitzhak Abravanel, imagine a world that has experienced salvation? What is the nature of reality in the days of the Messiah? This work explores reactions to the seductive promises of apocalyptic teachings, tracing their fluctuations between intellect and imagination. The volume extensively surveys the tension between naturalistic and apocalyptic approaches to the history of the messianic idea so fundamental to the history of Jewish philosophy in the Middle Ages and reveals the scope and challenges of medieval thought.