Abu Hamid Muhammadal-Ghazaliis regarded as one of the most influential thinkers of medieval Islam. A theologian, logician, jurist, and mystic, he is known for revealing the compatibility of the outward forms of religion with the inner experiences of the Sufi and mystical traditions.H. T. Littlejohnis a retired pastor and lecturer who has devoted many years of study to both Christian and Muslim theology. He lives in Seattle.