In 12th-century Toledo, in Spain, a group of Christian monks, Jewish sages and Muslim teachers gathered to study a new translation of Aristotle's De Anima (On the Soul). In Rubenstein's dazzling historical narrative, this moment represents both the tremendous influence of Aristotle on these three religions and the culmination of the medieval rediscovery of his writings. In the fourth century B.C., Aristotle fashioned a new system of philosophy, focusing on the material world, whose operations he explained by a series of causes. As Rubenstein (When Jesus Became God) explains, in the second and third centuries A.D., Western Christian scholars suppressed Aristotle's teachings, believing that his emphasis on reason and the physical world challenged their doctrines of faith and God's supernatural power. By the seventh century, Muslims had begun to discover Aristotle's writings. Islamic thinkers such as Avicenna and Averroës, in the 11th and 12 centuries, embraced Aristotle's rationalist philosophy and principles of logic. Christian theologians rediscovered Aristotle through the commentaries of the monk Boethius, who argued in the sixth century that reason and understanding were essential elements of faith. There resulted a tremendous ferment in the study of Aristotle in the Middle Ages and early Renaissance, culminating in the work of Thomas Aquinas, who used Aristotle's notion of an Unmoved Mover and First Cause to construct his arguments for God's existence. Aquinas, too, argued that reason was a necessary component of faith's ability to understand God and the world. Although the book purports to trace Aristotle's influence on Christianity, Islam and Judaism, it devotes more attention to Christianity. Even so, Rubenstein's lively prose, his lucid insights and his crystal-clear historical analyses make this a first-rate study in the history of ideas. (Oct.)
