This site was built to read Imam al-Ghazālī’s Iḥyāʾ ʿUlūm al-Dīn together with source summaries and teacher lessons. The introduction below brings together the entries of the TDV Encyclopedia of Islam and the emphases of Prof. Dr. Ömer Türker in his Iḥyāʾ ʿUlūm al-Dīn seminars.
Ḥujjat al-Islām Abū Ḥāmid Muḥammad al-Ghazālī al-Ṭūsī was born in 450 AH (1058 CE) in the city of Ṭūs in Khorasan; he died in Ṭūs on 14 Jumādā al-Ākhira 505 (18 December 1111). He is known as an Ashʿarī theologian (mutakallim), a Shāfiʿī jurist, and a Sufi; in medieval Western literature he is referred to as Algazel.
In his youth he trained at the Niẓāmiyya of Nīshāpūr under Imām al-Ḥaramayn al-Juwaynī. In 484 (1091) he was appointed professor (mudarris) at the Niẓāmiyya Madrasa of Baghdad, where he taught hundreds of students and carried out intensive studies on philosophy and Bāṭinism. In Maqāṣid al-Falāsifa he summarized the system of the philosophers; then, in Tahāfut al-Falāsifa, he criticized their metaphysical claims.
As Prof. Dr. Ömer Türker emphasizes in his seminar, at the height of his career al-Ghazālī fell into a severe crisis of doubt lasting about six months: he could convince others, yet could find no satisfaction in his own inner world. In 488 (1095) he left Baghdad and set out on a long journey of ascetic discipline (riyāḍa) and contemplation. During this period he saw that theology, philosophy, and Bāṭinism did not suffice him, and placed the Sufi experience at the center of his search for truth. In Türker’s words, for al-Ghazālī the Sufis are the group who can ground their claim to truth through their lived experience.
Toward the end of his life he returned to teaching; in Ṭūs he founded a madrasa for jurists (fuqahāʾ) and a khānqāh for Sufis. His autobiographical work al-Munqidh min al-Ḍalāl (Deliverance from Error) is the account of this search in his own words.
Iḥyāʾ ʿUlūm al-Dīn (The Revival of the Religious Sciences) is the most voluminous and influential work al-Ghazālī wrote during his period of seclusion. As the TDV entry notes, both its title and its preface present the work as a project of reform (iṣlāḥ) for the umma: he says he wrote this book upon seeing that the scholars who ought to be the vanguard of the path to the Hereafter had become bound to formalism and the demands of politics, that the concept of knowledge had degenerated, and that the path followed by the early generations (salaf) had been forgotten.
The work is built upon four rubʿ (quarters); each quarter contains ten “books” (kitāb) — forty books in total:
1. Rubʿ al-ʿibādāt (Acts of Worship) — knowledge, creed, purification, prayer, alms, fasting, pilgrimage, Qurʾān recitation, remembrance (dhikr) and supplication, and the daily litanies (awrād). 2. Rubʿ al-ʿādāt (Customs) — eating and drinking, marriage, earning a living, the lawful and the unlawful, companionship, seclusion, listening to music (samāʿ), enjoining good, livelihood, and the character of the Prophet. 3. Rubʿ al-muhlikāt (The Destructive Vices) — the afflictions of the soul: the tongue, anger, love of the world, miserliness, status-seeking and ostentation, arrogance, conceit… 4. Rubʿ al-munjiyāt (The Saving Virtues) — repentance, patience and gratitude, fear and hope, poverty and asceticism, divine unity and trust in God, love, intention and sincerity, self-examination, contemplation, and death and the Hereafter.
The distinctive feature of Iḥyāʾ ʿUlūm al-Dīn is that it treats not only the outward pillars of the acts of worship but also what al-Ghazālī calls the “works of the heart” — humility (khushūʿ), sincerity (ikhlāṣ), and the moral dimension. In this way the work holds a special place in Islamic culture for the psychology of worship.
The main thesis of Türker’s seminar is this: the “knowledge” spoken of here is not a list of modern disciplines but knowledge that, once learned, makes a person religious. And religiosity is not merely formal worship but grasping the meaning of these acts of worship and cleansing the heart of occupation by anything other than God. As in the example “cleanliness is half of faith,” the early generations did not content themselves with physical cleanliness; true purification is being cleansed of the diseases of the soul.
Türker also explains the historical weight of the work within this framework: because Iḥyāʾ ʿUlūm al-Dīn turned the truths voiced by the Sufis into a model of religiosity applicable to the general body of the umma, it was read aloud as a book in mosques; it became the “bedside book” of Ibn ʿArabī — one of the founding figures of post-Ghazālian Sufism — and was read cover to cover many times in his gatherings. This is why it left its mark on the history of Muslim society’s religiosity as much as on the history of thought.
For this reason Iḥyāʾ ʿUlūm al-Dīn is not a digest that replaces a book of jurisprudence; it is a claim to the revival of religious knowledge and of the lived experience of religiosity. As a classic saying goes: if all books concerning Islam were lost and only Iḥyāʾ ʿUlūm al-Dīn remained, one would not miss the others — an exaggeration, to be sure, yet one that shows the work’s place in the memory of the umma.
The aim is clear: to read and understand Iḥyāʾ ʿUlūm al-Dīn. The site offers three layers; the suggested order is:
1. Book chapters — Summaries and analysis of the text. 4 volumes, 40 chapters; a source digest for each. 2. Ömer Türker lessons — A wide-angle Ihya–Ghazali narrative. Build the big picture and method here. 3. Muhammed Yazıcı lessons — Chapter-by-chapter video reviews. Follow the playlist; each lesson has main points and key emphases.
You can also jump via the Glossary to terms and via tags to themes. The intent of reading: not to pile up information, but to let what you learn transform you.