The teaching chair and the crisis
Abū Ḥāmid Muḥammad al-Ghazālī was born in 1058 in Ṭūs, in the northeastern Persian region of Khurāsān, into a household with Sufi sympathies — his father had been a wool-spinner who attended the lectures of the local shaykhs, and asked, in his dying request, that his sons receive a religious education. Al-Ghazālī's exceptional intellect carried him through the leading madrasas of the region to the patronage of the Saljuq vizier Niẓām al-Mulk, who appointed him at thirty-three to the chair of jurisprudence at the Niẓāmiyya madrasa in Baghdad — the most prestigious teaching post in the Islamic world. He taught there for four years, wrote prolifically on Aristotelian logic and on the refutation of philosophy (his Tahāfut al-Falāsifa — The Incoherence of the Philosophers — dismantled the metaphysics of Ibn Sīnā and al-Fārābī in their own terms), and was, by every external measure, the leading religious intellect of his generation.
In July 1095 his speech failed. The biographical record — which is unusually full because al-Ghazālī himself wrote about it in al-Munqidh min al-Ḍalāl, The Deliverance from Error — describes a six-month physical breakdown that he diagnosed as a discrepancy between his outer teaching and his inner state. He arranged for his dependants, divided his books, left Baghdad on a pretext of pilgrimage, and disappeared from the institutional world for eleven years. The interval is usually called his Sufi turn, though the description is misleading: he did not convert from one position to another. He concluded that the inner discipline of the wool-clad masters — the practices the Sufi lineages had pursued in obscurity for several centuries — was the operative content of the religion the jurists and the philosophers had been arguing about from the outside.
The Iḥyāʾ
He returned to teaching in 1106 — first in Nīshāpūr, then back in Ṭūs — and wrote, across the eleven years of withdrawal and the years after, what is generally treated as the most consequential work of Islamic devotional literature: Iḥyāʾ ʿulūm al-dīn, The Revival of the Religious Sciences. The forty books of the Iḥyāʾ take the entire structure of Islamic religious life — ritual purification, prayer, fasting, almsgiving, marriage, eating, earning a living, the disciplines of the inner faculties, the stations of love and trust and patience — and re-describe each from the inside, asking in every case what the outer form is for, what inner state it is meant to cultivate, and what failure mode it is exposed to when the inner content is missing. The treatise is the document in which the sharīʿa and the ṭarīqa — the outer law and the inner path — are presented as one organism rather than as rival programmes.
The effect on Islamic religious history was immediate and lasting. After the Iḥyāʾ, the line that Sufi practice was a marginal or heterodox accessory to mainstream Sunni Islam became difficult to hold. Sufi orders flourished across the next several centuries under the cover the Iḥyāʾ had effectively given them; the fuqahāʾ (jurists) who had been suspicious of Sufi vocabulary now had a four-volume treatise by their most prestigious colleague describing the inner practice as the heart of the religion they themselves were administering. The settlement held — with periodic disruptions — until the eighteenth-century reformist movements began to reopen the question.
The integrator, not the originator
Al-Ghazālī did not invent any of the practices he wrote about. *Dhikr* — the remembrance of God by repeated invocation — was already centuries old; the stations of love, fear, hope, gratitude and trust had been mapped by earlier Sufi masters such as al-Muḥāsibī and al-Qushayrī; the analysis of the inner faculties had a long Aristotelian-Islamic genealogy he himself only helped to refine. What he did was give the existing inner discipline a settlement with the orthodox legal and theological frame that other Sufi voices — al-Ḥallāj, executed in 922 for his ecstatic utterance anā al-ḥaqq, I am the Real — had failed to secure. He is in this respect the integrator rather than the originator: the figure under whose authority the inner work became uncontroversially mainstream Sunni practice for the next nine centuries. The contemplative current the mysticism entry maps as the inner dimension of every major tradition has, in Islam, the institutional shape it does largely because of his work.
His later writings — the Kīmiyā-yi Saʿādat (The Alchemy of Happiness, a vernacular Persian abridgement of the Iḥyāʾ aimed at lay readers), the Mishkāt al-Anwār (The Niche of Lights, a short metaphysical treatise on the divine light that Ibn ʿArabī would later read closely), and a substantial late correspondence — were written after the long crisis had stabilised into a settled view. He died in Ṭūs in December 1111, at fifty-three. The autobiography from the early stage of the crisis remains in print today in dozens of languages; the Iḥyāʾ in its forty-book entirety remains a working text in Sunni religious education across the Arabic-speaking world.
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