Al-Ghazali vs Averroes
The Incoherence of the Philosophers vs The Incoherence of the Incoherence
Venue: Written exchange across a century: al-Ghazali's *Tahafut al-Falasifa* (1095, Baghdad); Averroes's *Tahafut al-Tahafut* (c. 1180, Cordoba).
Can philosophy reach truth independently of revelation, or does reason without faith lead to incoherence?
Al-Ghazali's *Tahafut al-Falasifa* (The Incoherence of the Philosophers) attacked twenty theses of the Islamic Aristotelians — principally Avicenna — on three grounds deemed outright heretical: the eternity of the world, God's ignorance of particulars, and denial of bodily resurrection. Al-Ghazali argued that the philosophers' claims outstrip what demonstrative reason can establish and contradict revealed truth. Nearly a century later, Averroes replied point by point in the *Tahafut al-Tahafut* (The Incoherence of the Incoherence), defending philosophy's capacity for demonstrative truth and arguing that al-Ghazali himself relied on dialectical reasoning he claimed to reject. Averroes maintained the compatibility of philosophy and religion through a theory of double truth or interpretive levels — the philosopher and the believer reach the same truth by different paths. The exchange shaped the subsequent trajectories of Islamic and Western philosophy: al-Ghazali's critique helped marginalise philosophy in the Islamic East, while Averroes's defence profoundly influenced Latin scholasticism.
Historical Context
By al-Ghazali's time, the Aristotelian-Neoplatonic synthesis of al-Farabi and Avicenna dominated Islamic intellectual culture. Al-Ghazali, a scholar of Ash'arite theology who underwent a spiritual crisis, attacked the philosophers not from ignorance but from deep familiarity (his *Maqasid al-Falasifa* accurately summarised their views). Averroes wrote from Islamic Spain, the last major centre of Aristotelian philosophy in the Islamic world.
Parties
The philosophers' central claims — especially the eternity of the world, God's ignorance of particulars, and denial of bodily resurrection — are neither demonstratively proven nor compatible with revelation. Philosophy's pretensions to autonomous truth are incoherent.
Key arguments
- The eternity of the world cannot be proven: the philosophers' arguments for it are dialectical, not demonstrative.
- Causation is not necessary: God directly produces all effects; what we call "cause" is customary conjunction, not logical entailment.
- The philosophers' God, who knows only universals, cannot ground providence or resurrection.
- On three counts the philosophers are guilty of kufr (unbelief): eternity of the world, divine ignorance of particulars, denial of bodily resurrection.
Allied schools
Demonstrative philosophy and revelation reach the same truth by different methods. Al-Ghazali's critique itself relies on the philosophical reasoning it purports to reject; his occasionalism destroys natural knowledge.
Key arguments
- Al-Ghazali's denial of natural causation is self-undermining: if causes have no necessary connection to effects, no knowledge of the natural world is possible.
- The Qur'an commands the study of philosophy ("Reflect, you who have eyes") — philosophy and revelation are harmonious.
- Different intellectual capacities require different modes of access to truth: demonstrative, dialectical, rhetorical — but the truth reached is one.
- Avicenna's errors do not invalidate Aristotelian philosophy as such; al-Ghazali attacks a straw man.
Allied schools
Dimensions Engaged
Observer
Observer · Metaphysical Agency: can human reason operate autonomously in metaphysics, or does it require revelation's guidance?
Time
Time · Ontological Status: the eternity of the world — is time created or co-eternal with God?
Matter
Matter · Causation: does natural causation obtain necessarily, or is every event a direct divine act (occasionalism)?
Verdict in retrospect
In the Islamic world, al-Ghazali's critique largely prevailed: philosophy as an autonomous discipline declined in the Sunni East (though it continued in Shi'ite Iran). In Latin Christendom, Averroes's defence of Aristotle profoundly shaped scholastic philosophy, earning him the title "The Commentator." The double-truth thesis attributed to him was condemned at Paris in 1277 but continued to influence intellectual life. Modern assessments tend to see both positions as more nuanced than the polemics suggest.
Related Debates
Sharing parties or aligned schools.
Related Experiments
Experiments that share dimensions and/or aligned schools with this debate.
Other Personas Aligned With This Debate
Ranked by declared-influence weight in the schools either party is allied with. The named parties themselves are excluded — they're already listed above.
Works Most Aligned With This Debate
Ranked by declared-influence weight in the schools either party is allied with.
Related Films
Films engaging the same dimensions as this debate.
Related Contemporary Dilemmas
Dilemmas that engage the same dimensions as this debate.
Further reading
- Al-Ghazali, *The Incoherence of the Philosophers* (tr. Marmura, 1997)
- Averroes, *The Incoherence of the Incoherence* (tr. Van Den Bergh, 1954)
- Leaman, *Averroes and His Philosophy* (1988)
- Griffel, *Al-Ghazali's Philosophical Theology* (2009)