Al-Ghazali

Abū Ḥāmid al-Ghazālī, 1058–1111. The most influential Muslim theologian after the first generation of the Prophet's companions. Persian by birth, he held the most prestigious teaching chair in the Islamic world — the Nizamiyya of Baghdad — by his early thirties. At thirty-eight he had a spiritual breakdown: he found he could no longer speak the words of orthodox theology with conviction. He walked away from his career, his salary, and his family, and spent the next eleven years as a wandering Sufi, working out what he actually believed. He came back transformed and wrote the *Iḥyāʾ ʿUlūm al-Dīn* — *The Revival of the Religious Sciences* — a forty-book work that rebuilt Islamic practice from the inside out, weaving law, theology, ethics, and Sufi mysticism into one fabric. It is still one of the most read books in the Muslim world. He also wrote a stinging philosophical treatise (*The Incoherence of the Philosophers*) and a short, devastating spiritual autobiography (*Deliverance from Error*). Core teaching: religious knowledge that does not change you is dead. The heart is the organ of true knowing, and it has its own discipline. Polish the mirror until the divine light can be received. Key works: *Iḥyāʾ ʿUlūm al-Dīn* (*The Revival of the Religious Sciences*), *Tahāfut al-Falāsifa* (*The Incoherence of the Philosophers*), *al-Munqidh min al-Ḍalāl* (*Deliverance from Error*), *Mishkāt al-Anwār* (*The Niche of Lights*).