Imam al-Ghazali
Suggest editLife and Early Career
Abu Hamid Muhammad ibn Muhammad al-Ghazali al-Tusi (450 AH / 1058 CE – 505 AH / 1111 CE), widely known as Hujjat al-Islam (the Proof of Islam), was born in Tus, in the Khorasan region of Persia (present-day Iran). He was orphaned early and raised under the care of a Sufi friend of his father. His exceptional intellectual gifts became apparent from youth, and he eventually came under the patronage of the powerful Seljuk vizier Nizam al-Mulk, who appointed him professor at the Nizamiyyah university of Baghdad — the most prestigious academic post in the Sunni world — when he was just 33 years old.
For four years he lectured to hundreds of students on Islamic jurisprudence, theology, and philosophy, amassing acclaim that was unequaled in his time. Yet beneath this external success, an internal crisis was building. He began to question whether his knowledge was truly benefiting his soul, or whether it was merely serving his ego and social ambition.
The Spiritual Crisis and Transformation
In 488 AH (1095 CE), al-Ghazali experienced what he later described as a complete breakdown of certainty. He found himself physically unable to speak or teach and, after a period of illness and paralysis, he abandoned his position in Baghdad and departed as a wandering ascetic. For nearly eleven years he traveled — to Damascus, Jerusalem, Makkah, Madinah, and Alexandria — living a life of austerity, studying the Sufi path firsthand, and writing.
He documented this extraordinary journey in his autobiographical masterpiece Al-Munqidh min al-Dalal (Deliverance from Error), which remains one of the most lucid accounts of religious crisis and spiritual recovery ever written. He described his systematic examination of four groups in search of truth: theologians (mutakallimun), philosophers (falasifah), Isma'ili esotericists (batiniyyah), and Sufis — concluding that the Sufis had the most direct access to experiential knowledge of Allah, but only when grounded in the Quran and Sunnah.
Major Works
Ihya Ulum al-Din (Revival of the Religious Sciences) is his magnum opus, a monumental four-volume work covering the entire span of religious life: acts of worship, social customs, destructive vices, and saving virtues. It synthesizes jurisprudence, ethics, psychology, and spirituality in a way that had never been done before. Imam al-Nawawi said: 'Were the books of Islam to be lost except for the Ihya, it would suffice to replace them.'
Tahafut al-Falasifah (The Incoherence of the Philosophers) is a rigorous critique of Muslim Aristotelians like al-Farabi and Ibn Sina (Avicenna), arguing that on three specific points — the eternity of the world, Allah's knowledge of particulars, and bodily resurrection — the philosophers had fallen into clear disbelief (kufr). This work was so influential that Ibn Rushd (Averroes) later wrote a rebuttal, Tahafut al-Tahafut.
Al-Mustasfa is one of the four foundational works in the science of usul al-fiqh (principles of jurisprudence), still studied in Islamic universities today. Kimiya-yi Sa'adat (The Alchemy of Happiness), written in Persian, is a condensed spiritual guide based on the Ihya.
Scholarly Assessment and Critiques
Al-Ghazali's contributions are immense and undisputed: his philosophical acumen, his ability to make spirituality intellectually rigorous, and his revitalization of Islamic ethical thought are without equal in the medieval period. However, later scholars — most notably Ibn Taymiyyah — raised concerns about aspects of his later writings, particularly elements in the Ihya that incorporate Sufi concepts and terminology not clearly grounded in authentic narrations. Ibn Taymiyyah praised al-Ghazali's critique of the philosophers but criticized what he saw as excessive reliance on weak hadiths and concepts borrowed from non-Islamic mystical traditions.
These critiques do not diminish al-Ghazali's overall standing. The Ihya remains one of the most widely read works in Islamic literature, and scholars across the Maliki, Shafi'i, and Hanbali schools have studied and taught it for centuries. Reading al-Ghazali with awareness of the scholarly discussion around specific passages is the balanced approach taken by serious students of knowledge.
Legacy
Al-Ghazali died in his hometown of Tus in 505 AH (1111 CE), reportedly in a state of deep spiritual peace, having returned to his simple origins after years of worldly fame and voluntary poverty. His life traced a remarkable arc — from academic star to wandering ascetic to the scholar who reconciled orthodoxy and genuine spirituality for generations to come. His influence on Islamic thought, and even on medieval European philosophy through Latin translations, continues to this day.