This volume offers an account of Abu Hamid al-Ghazali (d. 505/1111) as a rational theologian who created a symbiosis of philosophy and theology and infused rationality into Sufism. The majority of the papers herein deal with important topics of al-Ghazali's work, which demonstrate his rational treatment of the Qura'n and major subjects of Islamic theology and everyday life of Muslims. Some other contributions address al-Ghazali's sources and how his intellectual endeavors were later received by scholars who had the same concern of reconciling religion and rationality within Islam, Christianity and Judaism.