The eventful life of Abu Hamid Muhammad ibn Muhammad al-Ghazali (or al-Ghazzali) can be divided into three major periods. The first is the period of learning, first in his home town of Tus in Persia, then in Gurgan and finally in Nishapur. After the death of his teacher, Imam al-Haramayn AL-JUWAYNI, Ghazali moved to the court of Nizam al-Mulk, the powerful vizir of the Seljuq Sultans, who eventually appointed him head of the Nizamiyyah College at Baghdad in AH 484/AD 1091.
The second period of al-Ghazali’s life was his brilliant career as the highest-ranking orthodox ‘doctor’ of the Islamic community in Baghdad (AH 484-8/AD 1091-5). This period was short but significant. During this time, as well as lecturing on Islamic jurisprudence at the College, he was also busy refuting heresies and responding to questions from all segments of the community. In the political confusion following the assassination of Nizam al-Mulk and the subsequent violent death of Sultan Malikshah, al-Ghazali himself fell into a serious spiritual crisis and finally left Baghdad, renouncing his career and the world.
This event marks the beginning of the third period of his life, that of retirement (AH 488-505/AD 1095-1111), but which also included a short period of teaching at the Nizamiyyah College in Nishapur. After leaving Baghdad, he wandered as a Sufi in Syria and Palestine before returning to Tus, where he was engaged in writing, Sufi practices and teaching his disciples until his death.
The inner development leading to his conversion is explained in his autobiography, al-Munqidh min al-dalal (The Deliverer from Error), written late in his life. It was his habit from an early age, he says, to search for the true reality of things. In the process he came to doubt the senses and even reason itself as the means to ‘certain knowledge’, and fell into a deep scepticism. However, he was eventually delivered from this with the aid of the divine light, and thus recovered his trust in reason. Using reason, he then set out to examine the teachings of ‘the seekers after truth’: the theologians, philosophers, Isma‘ilis and Sufis. As a result of these studies, he came to the realization that there was no way to certain knowledge except through Sufism. In order to reach this ultimate truth of the Sufis, however, it is first necessary to renounce the world and to devote oneself to mystical practice. Al-Ghazali came to this realization through an agonising process of decision, which led to a nervous breakdown and finally to his departure from Baghdad.
The schematic presentation of al-Munqidh has allowed various interpretations, but it is irrelevant to question the main line of the story. Though certain knowledge is explained in al-Munqidh as something logically necessary, it is also religious conviction (yaqin) as mentioned in the Ihya’ ‘ulum al-din (The Revival of the Religious Sciences). Thus when he says that the traditional teachings did not grip him in his adolescence, he means to say that he lost his conviction of their truth, which he only later regained through his Sufi mystical experiences. He worked to generalize this experience to cure `the disease' of his time.
The life of al-Ghazali has been thus far examined mostly as the development of his individual personality. However, since the 1950s there have appeared some new attempts to understand his life in its wider political and historical context (Watt 1963). If we accept his religious confession as sincere, then we should be careful not to reduce his thought and work entirely to non-religious factors. It may well be that al-Ghazali’s conversion from the life of an orthodox doctor to Sufism was not merely the outcome of his personal development but also a manifestation of a new stage in the understanding of faith in the historical development of Islam, from the traditional form of faith expressed in the effort to establish the kingdom of God on Earth through the shari‘a to a faith expressed as direct communion with God in Sufi mystical experience. This may be a reflection of a development in which the former type of faith had lost its relevance and become a mere formality due to the political and social confusion of the community. Al-Ghazali experienced this change during his life, and tried to revive the entire structure of the religious sciences on the basis of Sufism, while at the same time arguing for the official recognition of the latter and providing it with solid philosophical foundations.
