An Islamic scholar abandoned wealth after doubt left him unable to speak, then sought God as a beggar

Al-Ghazali’s crisis of certainty

Abu Hamid al-Ghazali was one of the most prominent Muslim scholars of his era, teaching in Baghdad at a time when his learning and public standing brought him influence and material comfort. Yet he later described a crisis that struck at the basis of his work: he could no longer trust that his beliefs were certain. In his account, the crisis became so severe that he lost the ability to speak and could not carry on teaching.

His response was not simply to adopt a new argument. He left his post and possessions behind and spent years traveling in religious retreat, including periods of living with the austerity associated with a beggar. The journey turned a problem of knowledge into a practical test: what kind of life, and what kind of experience, could make faith feel secure rather than merely inherited or intellectually assembled?

What kashf meant to him

Al-Ghazali did not conclude that reasoning was useless. He had mastered theology and philosophy, and he continued to use argument in his writing. But he came to distinguish between understanding a claim and experiencing its truth with certainty. He called the latter kind of unveiling kashf: an intuitive disclosure through which spiritual realities become directly apparent to the person who experiences them.

That idea belongs to Islamic mysticism, often called Sufism. It does not mean that any strong feeling automatically proves a religious claim. In al-Ghazali’s account, insight required spiritual discipline—such as prayer, self-restraint, and detachment from worldly distraction—rather than a momentary impression. Reason could clarify beliefs and expose errors, but it could not by itself reproduce the inward certainty he sought.

The consequence of his retreat

Al-Ghazali eventually returned to teaching and writing, bringing his mystical understanding into conversation with Islamic law and theology. His life therefore illustrates a tension that remained important in Muslim thought: reason can guide the search for truth, while disciplined spiritual experience may be needed to make that truth inwardly real. His retreat was not an escape from scholarship so much as an attempt to discover what scholarship alone could not give him.