Abu Hamid al-Ghazālī, a Muslim jurist-theologian and polymath who lived from the mid-eleventh to the early twelfth century in present-day Iran, is a figure equivalent in stature to Maimonides in Judaism and Thomas Aquinas in Christianity. He is best known for his work in philosophy, ethics, law, and mysticism. In an engaged re-reading of the ideas of this preeminent Muslim thinker, Ebrahim Moosa argues that Ghazālī's work has lasting...