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University of Cambridge, England referred to Al Ghazali as follows: "He was
one of the greatest mystical theologians of Islam and indeed of all
mankind."

We recommend that you read "Pure Faith Defined" by Imam Ghazali
available at Mosque.com, a translation of Imam Ghazali's greatest work, in
which he explores in great detail and defines faith.

Abu Hamid Muhammad al-Ghazali was born at Tus in Persia in 450 A.H.
(1058 A.D.) His father died when he was quite young, but the guardian saw
to it that he and his brother received a good education. After the young
Ghazali had spent some years of study under the greatest theologian of the
age, al-Juwayni the Ihsanic (Sufi) Imam of al-Haramayn, his outstanding
intellectual gifts were noted by Nizam al-Mulk, the powerful minister (vizier)
of the Turkish sultan, who ruled the `Abbasid caliphate of Baghdad. He
appointed Ghazali professor at the university he had founded in the capital.
Thus at the age of thirty-three he had attained one of the most distinguished
positions in the academic world of his day.