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  • The_Savior_from_Spiritual_Error_and_50_Principles, page : 29

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.

Four years later at 37 years of age, he met a crisis; it had physical
symptoms but it was primarily spiritual and religious. He came to feel that the
one thing that mattered was avoidance of Hell and attainment of Paradise,
and he saw that his present way of life was too worldly to have any hope of
eternal reward.