What is Abū Ḥāmid al-Ghazālī's position on reason vis-à-vis revelation after the "Iḥyāʾ" and "Munqidh," and does it really differ from Ibn Rushd's position?

Al-Ghazālī's position on reason vis-à-vis revelation is among the most misunderstood topics in the history of Islamic thought. The prevailing stereotype — that al-Ghazālī was an "enemy of reason" and Ibn Rushd a "defender of reason" — is a misleading oversimplification that cannot withstand a reading of their mature texts. Understanding al-Ghazālī's true position, especially after the "Iḥyāʾ" and "al-Munqidh min al-ḍalāl," reveals a sophisticated conception of the relationship between reason and revelation that may be closer to Ibn Rushd's than is commonly supposed.

Necessary corrections to common misunderstandings

From some defenders of al-Ghazālī:

"Al-Ghazālī never criticized reason, only the philosophers." This is inaccurate. Al-Ghazālī criticized certain uses of reason, especially in metaphysics. In "Tahāfut al-falāsifa" there is criticism of abstract reason when it exceeds its limits. The distinction is important: it is not a rejection of reason, but a delimitation of its domain.

"Al-Ghazālī's position on reason is the same from his first works to his last." This is a superficial reading. There is clear development from "Miʿyār al-ʿilm" (strictly logical) to "al-Munqidh min al-ḍalāl" (balance between reason and spiritual taste) to "al-Mustaṣfā" (advanced uṣūlī theorization). The mature al-Ghazālī is not the early al-Ghazālī.

From some defenders of Ibn Rushd:

"Ibn Rushd defended absolute reason against the Sufi al-Ghazālī." This is reductive. Ibn Rushd in "Faṣl al-maqāl" and "al-Kashf ʿan manāhij al-adilla" sets clear limits for demonstrative reason, and distinguishes between levels of discourse (demonstrative/dialectical/rhetorical). Both believe in limits for reason; the difference lies in determining these limits.

"Al-Ghazālī caused the decline of the Islamic world by his attack on philosophy." This is a simplistic narrative promoted by Ernest Renan and copied by many. Historical reality is more complex: the flourishing of natural sciences and mathematics continued for centuries after al-Ghazālī, and philosophy itself developed in new directions (Illuminationism, transcendent wisdom) influenced by his critique.

Why these readings are inadequate

They fail to recognize that both al-Ghazālī and Ibn Rushd faced the same basic dilemma: how do we reconcile two sources of knowledge (reason and revelation) that sometimes appear contradictory? Their solutions differ in details, but they share a rejection of extremism (complete rejection of reason or complete rejection of revelation).

Al-Ghazālī's mature position: Hierarchical integration

In "al-Munqidh min al-ḍalāl," al-Ghazālī describes his intellectual journey through four stages: theology (kalām), philosophy, Bāṭinism, and Sufism. The result is not a rejection of reason, but placing it in a broader context:

Demonstrative reason: Perfectly valid in its domain (mathematics, logic, natural sciences). Al-Ghazālī does not criticize mathematical proofs or formal logic. In "Miʿyār al-ʿilm" he fully adopts Aristotelian logic. The problem arises when this reason is used in domains that exceed its capacity.

Limits of reason in metaphysics: In "Tahāfut al-falāsifa," the basic criticism is that abstract reason cannot demonstrate certain metaphysical propositions (eternity of the world, God's knowledge of particulars, bodily resurrection). This is not "against reason," but "beyond the capacity of demonstrative reason."

Revelation as a complementary epistemic source: For al-Ghazālī, revelation is not "against reason," but complements what reason cannot grasp. In matters that reason can reach (God's existence, some of His attributes), revelation confirms. In matters where reason is incapable (details of the afterlife, nature of prophecy), revelation informs.

Sufi spiritual taste as experiential knowledge: The distinctive addition in the later al-Ghazālī: mystical knowledge (kashf) as a third path. It is not against reason or revelation, but experiential confirmation of what is grasped theoretically. In the "Iḥyāʾ," ethics and worship have a spiritual dimension that cannot be grasped by abstract reason alone.

Ibn Rushd's position: Methodical interpretation

In "Faṣl al-maqāl" and "al-Kashf ʿan manāhij al-adilla," Ibn Rushd presents a sophisticated theory:

Obligation of rational investigation: The Sharīʿa commands rational investigation ("Say: observe what is in the heavens and the earth"). Rational demonstration is a legal path to knowing God. Those who possess demonstrative capacity are obligated to use it.

Interpretation when there is apparent conflict: If the apparent meaning of a text conflicts with certain rational demonstration, the text must be interpreted. But — here is the precision — only certain demonstrations require interpretation, not probable ones. And only people of demonstration are qualified for interpretation.

Ranks of people in understanding: People are of three types: demonstrative (philosophers), dialectical (theologians), rhetorical (common people). Each type has an appropriate method for understanding the Sharīʿa. Error occurs when we impose one type's method on another.

Limits of interpretation: Not everything is subject to interpretation. The three principles (God's existence, prophecies, resurrection) are not interpreted for the common people. Demonstrative interpretations remain among the people of demonstration.

Comparing the projects: Surprising agreements

Both reject absolute rationalism: Al-Ghazālī limits reason in metaphysics, Ibn Rushd restricts rational interpretation to demonstrative scholars and prohibits it for the common people.

Both reject complete separation between reason and revelation: Al-Ghazālī sees revelation as complementing reason, Ibn Rushd sees reason as legally commanded.

Both believe in hierarchical knowledge: Al-Ghazālī with a hierarchy of (reason/revelation/spiritual taste), Ibn Rushd with a hierarchy of (demonstration/dialectic/rhetoric).

Both warn against methodological confusion: Al-Ghazālī warns against using abstract reason in the domain of spiritual taste, Ibn Rushd warns against spreading demonstrative interpretations among the common people.

Real differences

Extent of confidence in reason in metaphysics: Ibn Rushd has more confidence in demonstration's ability to prove metaphysical propositions (eternity of the world in form, God's knowledge). Al-Ghazālī sees these propositions as beyond the capacity of definitive demonstration.

Place of Sufism: Al-Ghazālī integrates the Sufi dimension as an epistemic source, Ibn Rushd is cautious about mystical knowledge not subject to rational control.

Attitude toward the masses: Al-Ghazālī in the "Iḥyāʾ" addresses a broad audience in language that combines reason and feeling, Ibn Rushd is strict in separating levels of discourse.

Unacknowledged mutual influences

Ibn Rushd read al-Ghazālī deeply (evident from "Tahāfut al-tahāfut"). His distinction between ranks of people resembles al-Ghazālī's distinction in "Iljām al-ʿawāmm ʿan ʿilm al-kalām." Even his critique of al-Ghazālī sometimes adopts Ghazālian premises (such as the distinction between demonstration and dialectic).

The later al-Ghazālī in "al-Mustaṣfā" shows development in dealing with uṣūlī reason that is more confident and technical. As if his early critique of absolute reason opened space for more precise use of reason in its appropriate domain.

Contemporary position: New readings

Frank Griffel's studies show that al-Ghazālī was not "against philosophy," but an innovator within it. His synthesis of Ashʿarism, Aristotelian logic, and philosophical Sufism produced a new synthesis that positively influenced later Islamic philosophy.

Recent studies of Ibn Rushd (such as works by Muhsin Mahdi and Dimitri Gutas) show that he was not a "secular rationalist," but a committed Muslim philosopher who saw philosophy as serving the Sharīʿa, not as an alternative to it.

Conclusion: Integration, not opposition

The stereotype (al-Ghazālī against reason, Ibn Rushd for reason) misses the deeper picture: both seek balance between reason and revelation, with differences in details. Al-Ghazālī tends to expand sources of knowledge (reason + revelation + spiritual taste), Ibn Rushd tends to systematically organize the use of reason (ranks of demonstration and interpretation).

In the context of "rational preponderance" (rajḥān ʿaqlī) that we adopt, both positions offer valuable insights. What is required is not choosing between "al-Ghazālī or Ibn Rushd," but benefiting from both their insights in building a balanced understanding of the relationship between reason and revelation.

For advanced reading

─ Advanced level: Al-Ghazālī and causality - a contemporary reading in light of philosophy of science
─ Advanced level: Ibn Rushd and interpretation - comparison with contemporary hermeneutics
─ Al-Ghazālī, "al-Munqidh min al-ḍalāl" and "Iljām al-ʿawāmm ʿan ʿilm al-kalām"