Ihya’ ‘Ulum al-Din, “The Revival of the Religious Sciences,” is the best-known work of Abu Hamid al-Ghazali. It is long, but it is also carefully organised, which makes it easier to approach than its size suggests. This guide maps its four quarters, points to the books most connected with the Sufi path, and offers practical reading tips.
Quick answer
Short answer: The Ihya is divided into four quarters of ten books each, forty books in all: worship, daily customs, the vices that ruin the soul, and the virtues that save it (ghazali.org). Britannica describes it as showing how Islam’s doctrines and practices can become “the basis of a profound devotional life” (Britannica).
Key takeaways
- Author: Abu Hamid al-Ghazali, born c. 1058 in Tus, died 1111 (biography).
- Context: he left his teaching post in Baghdad in 1095 CE before writing the Ihya (overview).
- Structure: 4 quarters × 10 books = 40 books (ghazali.org).
- Free English extracts: a 1921 selection is on Project Gutenberg.
Who was al-Ghazali?
Al-Ghazali was born around 1058 in Tus, in Khurasan, and died in 1111 (biography). He studied under the great scholar al-Juwayni and in 1091 was appointed to teach at the Nizamiyya college in Baghdad. His contemporaries gave him the title Hujjat al-Islam, “Proof of Islam.”
In 1095 he went through a spiritual crisis and left his post (biography). He travelled, including to Damascus, Jerusalem and Makkah for pilgrimage, and was drawn to the way of the Sufis. That journey shaped the Ihya (overview).
He tells part of this story himself in al-Munqidh min al-Dalal. A public-domain English version, The Confessions of Al Ghazzali translated by Claud Field, is on Project Gutenberg.
The four quarters at a glance
The Ihya moves from outward practice to the inner life. The first half deals with worship and everyday conduct; the second half turns to the heart (ghazali.org).
| Quarter | Arabic name | Books | What it covers |
|---|---|---|---|
| Worship | Rub’ al-‘ibadat | 1–10 | Knowledge, creed, purification, prayer, charity, fasting, pilgrimage, Qur’an, remembrance |
| Customs | Rub’ al-‘adat | 11–20 | Eating, marriage, earning, friendship, travel, the Prophet’s character |
| Perils | Rub’ al-muhlikat | 21–30 | The heart, the tongue, anger, envy, love of wealth and fame, pride |
| Deliverance | Rub’ al-munjiyat | 31–40 | Repentance, patience, hope, trust, love, sincerity, death |
English book titles differ between translations. The names above follow the listing on ghazali.org.
The books closest to the Sufi path
Every quarter serves the inner life, but some books speak most directly to the themes of classical Sufism (ghazali.org):
- Book 9, Invocations and Supplications (Kitab al-adhkar wa’l-da’awat): remembrance and du’a. Pairs well with our introduction to dhikr.
- Book 10, The Arrangement of the Litanies and the Night Vigil: organising daily devotions.
- Book 21, The Wonders of the Heart and Book 22, Training the Soul: the foundations of inner refinement.
- Book 31, On Repentance: the opening book of the Quarter of Deliverance.
- Books 37–38, Intention, Sincerity and Truthfulness and Vigilance and Accounting (muraqaba and muhasaba).
Good to know
The Ihya has a link to another classic: al-Qushayri’s student Abu ‘Ali al-Farmadi taught al-Ghazali (overview). Both works hold inner devotion firmly within the Sunnah and the law.
How to read the Ihya
Do not start at Book 1 and try to push through all forty. The work is a library, and each book can be read on its own. Our general guide How to Read Classical Sufi Texts explains the slow, note-taking method that suits it.
A practical reading plan
1
Start with one book: Book 31 on Repentance or Book 37 on Intention are good first choices.
2
Read a section a day: a few pages read with attention beat a hurried chapter.
3
Note the evidence: write down the Qur’an verses and hadith he cites, then check them on reliable references.
4
Act on one point: al-Ghazali’s aim is practice, so choose one habit to change.
5
Ask a teacher: discuss unclear or difficult passages with a qualified scholar.
Tip
Al-Ghazali quotes many hadith, and the later scholar al-Hafiz al-‘Iraqi wrote a whole work, al-Mughni ‘an haml al-asfar, tracing their sources (ghazali.org). When a hadith matters to you, look it up in a graded reference rather than relying on the quotation alone.
Translations and free reading
The full Ihya is long, and many English translations of single books are modern publications. For free, public-domain reading, Some Religious and Moral Teachings of Al-Ghazzali (Baroda, 1921), translated by Syed Nawab Ali, gives short extracts from the Ihya (Project Gutenberg).
That edition’s introduction reflects early twentieth-century Western scholarship, so focus on the translated passages. Its table of contents also groups the books slightly differently from the standard forty-book list.
Closing reflection
The Ihya tries to bring knowledge, worship and character back together. Read it slowly, one book at a time, and let each section lead to sincere action. That, in the end, is what its title, “revival,” means.
This article is general educational content. Last checked: 6 October 2026.
Sources
- https://www.ghazali.org/listing-the-forty-books/
- https://www.britannica.com/topic/Ihya-ulum-al-din
- https://en.wikipedia.org/wiki/The_Revival_of_the_Religious_Sciences
- https://en.wikipedia.org/wiki/Al-Ghazali
- https://en.wikipedia.org/wiki/Al-Risala_al-Qushayriyya
- https://www.ghazali.org/ihya/ihya.htm
- https://www.gutenberg.org/ebooks/73140
- https://www.gutenberg.org/ebooks/58977