A Guide to the Perplexed by Moses Maimonides
According to Wikipedia, "Moses Maimonides (March 30, 1135 Cordoba, Spain ? December 13, 1204 Fostat, Egypt), was a rabbi, physician, and philosopher in Andalusia, Morocco and Egypt during the Middle Ages. He was one of the various medieval Jewish philosophers who also influenced the non-Jewish world. Although his copious works on Jewish law and ethics were initially met with opposition during his lifetime, he was posthumously acknowledged to be one of the foremost rabbinical arbiters and philosophers in Jewish history. Today, his works and his views are considered a cornerstone of Jewish thought and study." Active table of contents links to each chapter.