The Ghazalian Synthesis Balanced Reason and Revelation
Al-Ghazali's project is routinely mischaracterized as an attack on reason. In reality, he carved out one of the most sophisticated positions in intellectual history: reason is indispensable but insufficient it must be completed by revelation, not replaced by it.
"Al-Ghazali's explicit goal was 'to remove these questions from the realm of pure rational knowledge and assign their answer to another source of truth, namely revelation.'"
The Incoherence of the Philosophers (Tahafut al-Falasifa) was not a blanket rejection of philosophy. As Griffel demonstrates, al-Ghazali accepted many of the falasifa's conclusions including that the heavens are moved by souls (which he identified with the angels of the Quran). What he rejected was their claim that these truths were arrived at through pure demonstration alone. The falasifa claimed their arguments constituted apodictic proof (burhan); al-Ghazali showed, case by case, that these arguments fell short of their own standards. The ultimate source of these truths, he argued, was prophetic revelation, and the philosophers had unknowingly inherited insights from earlier prophets like Abraham and Moses, then falsely attributed them to reason alone.
This is a far more nuanced position than "reason bad, revelation good." Al-Ghazali used Aristotelian logic extensively he even wrote a standalone logic textbook. His position was that logic as a tool is neutral and useful, but the content of one's rational inquiry must be guided by something beyond reason itself. Wael Hallaq makes a parallel point about Islamic law: "while our reason is to be exercised to its fullest capacity, the content of rational thinking must be predetermined, transcendental and above and beyond what we can infer through our mental faculties."
Al-Ghazali's own spiritual crisis documented in his autobiographical Deliverer from Error embodied this synthesis. He mastered the intellectual sciences so thoroughly that he could demolish the philosophers on their own terms, then withdrew to pursue direct spiritual experience through Sufi practice. He returned not as an anti-intellectual but as someone who had experienced the limits of intellect and found what lay beyond them. His successor title, bestowed on Taha Abderrahmane Khalifah al-Ghazali speaks to the enduring relevance of this synthesis.
Takeaway: Al-Ghazali did not destroy Islamic philosophy he subordinated it to its proper place within a hierarchy of knowledge crowned by revelation and spiritual experience.
See also: Faith Is Not Opposed to Reason | Science and Religion Conflict Is a Modern Invention | Spiritual Practice Requires Discipline Not Feeling