Abū Ḥāmid Muḥammad ibn Muḥammad al-Ghazālī (1058–1111) (Arabic: ابو حامد محمد ابن محمد الغزالی), often Algazel in English, was born and died in Tus, in the Khorasan province of Persia. He was an Islamic theologian, jurist, philosopher, cosmologist, psychologist and mystic of Persian origin,[3][4] and remains one of the most celebrated scholars in the history of Sunni Islamic thought. He is considered a pioneer of methodic doubt and skepticism,[5] and in one of his major works, The Incoherence of the Philosophers, he changed the course of early Islamic philosophy, shifting it away from an Islamic metaphysics influenced by ancient Greek and Hellenistic philosophy, and towards an Islamic philosophy based on cause-and-effect that was determined by God or intermediate angels, a theory now known as occasionalism.
Ghazali has sometimes been acclaimed by secular historians such as William Montgomery Watt to be the greatest Muslim after Muhammad [6] (traditionally among Muslims, the greatest Muslims after the Prophet, according to authentic hadith, is the generation of his contemporaries). Besides his work that successfully changed the course of Islamic philosophy—the early Islamic Neoplatonism developed on the grounds of Hellenistic philosophy, for example, was so successfully refuted by Ghazali that it never recovered—he also brought the orthodox Islam of his time in close contact with Sufism.[7] The orthodox theologians still went their own way, and so did the mystics, but both developed a sense of mutual appreciation which ensured that no sweeping condemnation could be made by one for the practices of the other.[8]
Ghazali contributed significantly to the development of a systematic view of Sufism and its integration and acceptance in mainstream Islam. He was a scholar of Sunni Islam, belonging to the Shafi'i school of Islamic jurisprudence and to the Asharite school of theology. Ghazali received many titles such as Sharaful A'emma (Arabic: شرف الأئمّة), Zainuddin (Arabic: زين الدين), Hujjatul Islam, meaning "Proof of Islam" (Arabic: حجّة الاسلام). He is viewed as the key member of the influential Asharite school of early Muslim philosophy and the most important refuter of Mutazilites. However, he chose a slightly different position in comparison with the Asharites; his beliefs and thoughts differ, in some aspects, from the Asharite school.[9]
Ghazali was born in 1058 in Tus, a city in Khorasan province of Persia. His father, a traditional Sufi, died when he and his younger brother, Ahmad Ghazali, were still young. One of their father's friends took care of them for the next few years. In 1070, Ghazali and his brother went to Gurgan to enroll in a madrassah (Islamic seminary). There, he studied fiqh (Islamic jurisprudence) next to Ahmad ibn Muhammad Rādkānī and Abu'l Qāsim Jurjānī. After approximately 7 years studying, he returned to Tus.
His first important trip to Nishapur occurred around 1080 when he was almost 23 years old. He became the student of the famous Muslim scholar Abu'l Ma'ālī Juwaynī, known as Imam al-Haramayn. After the death of Al-Juwayni in 1085, Ghazālī was invited to go to the court of Nizamul Mulk Tusi, the powerful vizier of the Seljuq sultans. The vizier was so impressed by Ghazali's scholarship that in 1091 he appointed him as chief professor at the Al-Nizamiyya of Baghdad. He used to lecture to more than 300 students, and his participation in Islamic debates and discussions made him popular in all over the Islamic territories.
He passed through a spiritual crisis in 1095, abandoned his career, and left Baghdad on the pretext of going on pilgrimage to Mecca. Making arrangements for his family, he disposed of his wealth and adopted the life of a poor Sufi. After some time in Damascus and Jerusalem, with a visit to Medina and Mecca in 1096, he settled in Tus to spend the next several years in seclusion. He ended his seclusion for a short lecturing period at the Nizamiyyah of Nishapur in 1106. Later he returned to Tus where he remained until his death on December 19, 1111. He had one son named Abdu'l Rahman Allam.
Ghazali wrote more than 70 books on the sciences, early Islamic philosophy, Islamic psychology, Kalam and Sufism. His 11th century book titled The Incoherence of the Philosophers marks a major turn in Islamic epistemology, as Ghazali effectively discovered philosophical skepticism that would not be commonly seen in the West until René Descartes, George Berkeley and David Hume. The encounter with skepticism led Ghazali to embrace a form of theological occasionalism, or the belief that all causal events and interactions are not the product of material conjunctions but rather the immediate and present will of God.
The Incoherence of the Philosophers marked a turning point in Islamic philosophy in its vehement rejections of Aristotle and Plato. The book took aim at the falsafa, a loosely defined group of Islamic philosophers from the 8th through the 11th centuries (most notable among them Avicenna and Al-Farabi) who drew intellectually upon the Ancient Greeks. Ghazali bitterly denounced Aristotle, Socrates and other Greek writers as non-believers and labeled those who employed their methods and ideas as corrupters of the Islamic faith.
The Incoherence of the Philosophers is famous for proposing and defending the Asharite theory of occasionalism. Ghazali famously claimed that when fire and cotton are placed in contact, the cotton is burned directly by God rather than by the fire, a claim which he defended using logic. He argued that because God is usually seen as rational, rather than arbitrary, his behaviour in normally causing events in the same sequence (ie, what appears to us to be efficient causation) can be understood as a natural outworking of that principle of reason, which we then describe as the laws of nature. Properly speaking, however, these are not laws of nature but laws by which God chooses to govern his own behaviour (his autonomy, in the strict sense) – in other words, his rational will.
However, Ghazali did express support for a scientific methodology based on demonstration and mathematics, while discussing astronomy. After describing the scientific facts of the Solar eclipse resulting from the Moon coming between the Sun and Earth and the Lunar eclipse from the Earth coming between the Sun and Moon, he writes:[10]
Whosoever thinks that to engage in a disputation for refuting such a theory is a religious duty harms religion and weakens it. For these matters rest on demonstrations, geometrical and arithmetical, that leave no room for doubt.
In the next century, Ibn Rushd (also known in the West as Averroes) drafted a lengthy rebuttal of Ghazali's Incoherence entitled The Incoherence of the Incoherence; however, the epistemological course of Islamic thought had already been set.
The autobiography Ghazali wrote towards the end of his life, The Deliverance From Error (Al-munqidh min al-ḍalāl; several English translations[11]) is considered a work of major importance.[12] In it, Ghazali recounts how, once a crisis of epistemological skepticism was resolved by "a light which God Most High cast into my breast...the key to most knowledge,"[13] he studied and mastered the arguments of Kalam, Islamic philosophy. Though appreciating what was valid in the first two of these, at least, he determined that all three approaches were inadequate and found ultimate value only in the mystical experience and spiritual insight (Spritual intuitive thought – Firasa and Nur) he attained as a result of following Sufi practices. William James, in Varieties of Religious Experience, considered the autobiography an important document for "the purely literary student who would like to become acquainted with the inwardness of religions other than the Christian" because of the scarcity of recorded personal religious confessions and autobiographical literature from this period outside the Christian tradition.[14]