Abu Hamid Muhammad ibn Muhammad al-Ghazali was born in 1058 CE in Tus, a city in the Khorasan region of Persia (modern-day Iran). Orphaned at a young age, he and his brother were raised by a Sufi friend of their father who ensured they received proper Islamic education. Al-Ghazali demonstrated exceptional intellectual abilities from his youth, studying Islamic jurisprudence under prominent scholars including Imam al-Juwayni at the Nizamiyya Madrasa in Nishapur.

By his early thirties, al-Ghazali had achieved remarkable scholarly distinction. In 1091, the Seljuk vizier Nizam al-Mulk appointed him as the head professor at the prestigious Nizamiyya Academy in Baghdad, the most important center of Islamic learning in the Sunni world. At this institution, he taught Shafi'i jurisprudence, engaged with philosophical and theological questions, and gained widespread recognition as one of the leading scholars of his generation. His lectures attracted hundreds of students, and his reputation extended throughout the Islamic world.

However, in 1095, al-Ghazali experienced a profound spiritual and psychological crisis. Despite his outward success and scholarly mastery, he found himself troubled by questions of certainty, the spiritual authenticity of his pursuits, and the tension between intellectual accomplishment and genuine spiritual transformation. This crisis manifested physically, affecting his ability to speak and teach. After months of inner turmoil, he abandoned his prestigious position in Baghdad and embarked on a spiritual journey that would define the remainder of his life.

For over a decade, al-Ghazali traveled through Syria, Palestine, and Arabia, living as a Sufi ascetic. He spent time in Damascus, Jerusalem, Hebron, and made pilgrimage to Mecca. During this period of spiritual retreat and contemplation, he practiced Sufi disciplines, engaged in intensive worship, and reflected deeply on the integration of Islamic law, theology, and mystical practice. It was during these years of withdrawal from public life that he composed his magnum opus, the Ihya Uloom-Id-Din (Revival of Religious Sciences).

The Ihya represents al-Ghazali's synthesis of the Islamic sciences. Composed of forty books organized into four sections, the work addresses the acts of worship, social customs and manners, destructive vices, and virtues leading to salvation. The work demonstrates his comprehensive mastery of Islamic jurisprudence, theology, ethics, and Sufism, presenting them as complementary dimensions of a unified spiritual path rather than competing approaches.

Al-Ghazali eventually returned to teaching in Nishapur before retiring to his hometown of Tus, where he established a small school and khanqah (Sufi lodge). He continued writing until his death in 1111 CE. His intellectual legacy profoundly shaped subsequent Islamic thought across theological schools and regional boundaries. His successful integration of legal scholarship with mystical spirituality provided a model that influenced generations of Muslim scholars, making Sufism intellectually respectable within mainstream Sunni Islam and demonstrating that legal rigor and spiritual devotion could coexist harmoniously.