Kalām and Falsafa: Two Traditions of Islamic Philosophical Theology

الكلام والفلسفة: تقليدان في اللاهوت الفلسفي الإسلامي

Summary

Two distinct intellectual traditions developed within the Islamic world to articulate the philosophical foundations of theism: kalām (scholastic theology) and falsafa (philosophy). They emerged from different sources, used different methods, reached partly different conclusions, and shaped each other through centuries of mutual critique. The kalām tradition (Ashʿarī, Māturīdī, Muʿtazilī schools) developed from intra-Islamic theological controversies and was self-consciously committed to defending revealed doctrine through rational argument. The falsafa tradition (Kindī, Fārābī, Ibn Sīnā, Ibn Rushd) developed from engagement with Greek philosophy (especially Aristotle and the Neoplatonic tradition) and aimed at a more autonomous philosophical theology in continuity with the broader rational tradition. Within Maslik 1 (Philosophical and Metaphysical), the two traditions offer the major philosophical-theological resources available in the Islamic intellectual heritage; the framework engages both rather than choosing between them.

Two Different Origins

Kalām originated in early intra-Islamic theological controversies. The first major occasions were the disputes about the status of the grave sinner (the Khārijī, Murjiʾī, and Muʿtazilī positions) and about free will and divine determination (Qadariyya vs. Jabriyya). What began as controversy within the community required formal articulation of doctrinal positions and rational defense against counter-positions. By the end of the second Hijri century, this articulation had crystallized into the discipline later called ʿilm al-kalām.

Falsafa originated differently. The translation movement in early Abbasid Baghdad (eighth–tenth centuries) made available substantial Greek philosophical material in Arabic translation — Aristotle's Metaphysics, De Anima, the logical organon, Plotinus's Enneads (transmitted via the Theology of Aristotle and Liber de Causis), and much else. Falsafa was the Arabic-Islamic continuation of the Greek philosophical project. Its early major figures (Kindī d. ca. 873, Fārābī d. 950) saw themselves as contributing to the rational tradition that Plato and Aristotle had inaugurated.

This difference in origin shaped everything else. Kalām begins from revealed doctrine and elaborates it philosophically; falsafa begins from rational analysis and engages revelation philosophically.

The Major Schools and Figures

Within kalām

Muʿtazila (eighth–thirteenth centuries, with major fading after the Mongol period). Earliest of the major kalām schools. Distinctive doctrines: divine unity (tawḥīd) interpreted as denial of distinct divine attributes (the Muʿtazila called themselves ahl al-tawḥīd wa-l-ʿadl); divine justice (ʿadl) requiring real human free will; the createdness of the Qurʾan; rational moral obligation prior to revelation; the obligation of God to do what is best for humans (aṣlaḥ). Major figures: Abū l-Hudhayl al-ʿAllāf, al-Naẓẓām, al-Jubbāʾī, al-Qāḍī ʿAbd al-Jabbār.

Ashʿariyya (founded by Abū l-Ḥasan al-Ashʿarī, d. 936; dominant in Sunni kalām from the eleventh century onward). Distinctive doctrines: divine attributes are real but their modality is unknown (bilā kayf); the Qurʾan is uncreated (in its essential meaning, with the verbal recitation being created); human acts are created by God but acquired (kasb) by humans; morality is fundamentally revelation-dependent; occasionalism in causation (the most distinctive Ashʿarī thesis). Major figures: al- Ashʿarī, al-Bāqillānī, al-Juwaynī, al-Ghazālī, al-Rāzī.

Māturīdiyya (founded by Abū Manṣūr al-Māturīdī, d. 944; parallel Sunni kalām school, particularly influential in the Hanafi-Turkic world). Position generally between Muʿtazila and Ashʿariyya: accepts real divine attributes, defends some rational moral knowledge prior to revelation, more accommodating of human agency than Ashʿarī occasionalism. Major figures: al-Māturīdī, al-Pazdawī, al-Nasafī.

Within falsafa

al-Kindī (d. ca. 873). The first major faylasūf. Developed the cosmological argument (the universe must have a beginning and therefore a cause) in distinctively Islamic form, drawing on John Philoponus's earlier Christian use of Aristotle against the eternity of the world. Kindī's argument fed directly into the kalām cosmological argument later associated with al-Ghazālī.

al-Fārābī (d. 950). Systematizer of Islamic Aristotelian- Neoplatonic philosophy. Developed a hierarchical emanation scheme from the First (God) through the intellects, with prophecy understood as the highest form of human intellectual connection with the active intellect.

Ibn Sīnā (Avicenna, d. 1037). The most influential faylasūf. Distinctive contributions: the distinction between essence and existence in created beings, the argument from contingency to the necessary being (wājib al-wujūd), the doctrine of the soul as immaterial substance, the influential prophetology of the active intellect. See ibn-sina-necessary-being.

al-Ghazālī (d. 1111). Trained as Ashʿarī mutakallim, studied falsafa extensively, wrote both philosophical works and the great critique Tahāfut al-Falāsifa. The Tahāfut targeted twenty specific doctrines of falsafa (especially Ibn Sīnā's), arguing that some involved unbelief while others were merely false. See ghazali-tahafut-and-causation.

Ibn Rushd (Averroes, d. 1198). Last great faylasūf of the classical period. Wrote the Tahāfut al-Tahāfut responding to Ghazālī. Defended Aristotelian philosophy in closer continuity with Aristotle than Ibn Sīnā had practiced. Influential in the Latin West (much more than in subsequent Islamic philosophy).

Where They Diverge

Several major points of substantive disagreement:

The eternity of the world

Falsafa (Ibn Sīnā most clearly) defended the eternity of the world in a sense: the world is necessarily produced by God but God produces it from eternity, not at a temporal beginning. Kalām (especially Ghazālī) insisted on temporal creation: the world has a beginning in time. This was one of Ghazālī's three points against which he declared the falāsifa unbelievers.

Causation

Falsafa held to Aristotelian natural causation: natural things have real causal powers that operate by necessity. Ashʿarī kalām developed occasionalism: only God is a real cause; what appear to be natural causes are customary occasions for divine action. See ghazali-tahafut-and-causation.

Divine knowledge of particulars

Falsafa (Ibn Sīnā) held that God knows particulars only in universal terms — God knows that there are humans, knows the species and accidents, but does not know individual humans as such. Kalām insisted that God knows particulars as particulars. Ghazālī declared the falāsifa position unbelief.

Bodily resurrection

Falsafa tended to read resurrection as an allegory for the survival of the soul. Kalām insisted on real bodily resurrection. Ghazālī declared the falāsifa position unbelief.

Method

Beyond specific doctrines, the methodological divergence is fundamental. Falsafa sought truth through demonstration (burhān) on Aristotelian-syllogistic models. Kalām used dialectical argument (jadal) — argumentation from premises the opponent accepts, often with rhetorical components. The methodological difference is not absolute (philosophers used dialectic, theologians used demonstration), but the relative emphasis is genuine.

Where They Converge

Despite the divergences, both traditions converge on several major points:

Affirmation of God. Both kalām and falsafa argue for God's existence, though with different arguments. Kalām uses the temporal cosmological argument (the universe began, so it must have a cause); falsafa uses the contingency argument (contingent beings require a necessary being).

Divine simplicity. Both traditions (with Muʿtazilī and Ibn Sīnā most strongly) affirm divine simplicity, denying composition in God.

Negative theology. Both traditions accept that human language about God operates with significant limits, and both develop apparatus for managing this (Ashʿarī bilā kayf, Ibn Sīnā's distinction between essence and existence applied to God).

Engagement with revelation. Both traditions take the Qurʾanic claims seriously and develop their philosophical- theological positions in conversation with revealed doctrine. Falsafa is sometimes presented as philosophical-rationalist over against kalām, but the major falāsifa (Ibn Sīnā especially) developed elaborate treatments of prophecy and revelation.

The Ghazālī Synthesis and Its Aftermath

The most consequential intellectual development is al-Ghazālī's. Trained as Ashʿarī, deeply learned in falsafa, he produced both a critique of falsafa on specific doctrines (Tahāfut) and a substantial appropriation of falsafa's methods for kalām (Maqāṣid al-Falāsifa, the philosophical sections of al-Iqtisād fī al-Iʿtiqād). The Ghazālī synthesis transformed subsequent kalām: post-Ghazālī Ashʿarī kalām uses Aristotelian logic and incorporates substantial philosophical material while preserving distinctive Ashʿarī doctrines.

This had consequences for the long-term trajectory. Within the Islamic world, kalām and falsafa increasingly blended after the twelfth century, producing the muʿaqqar (post-classical) period in which figures like al-Rāzī, al-Ṭūsī, al-Ḥillī, and al-Taftāzānī wrote in styles that drew on both. Outside the Islamic world, falsafa (particularly Ibn Rushd) had its most lasting influence in the Latin West rather than in subsequent Islamic thought.

What Each Tradition Contributes to Maslik 1

The framework engages both traditions as living resources.

From kalām: the rigorous defense of revealed doctrine through rational argument; the development of the temporal cosmological argument; the occasionalist response to natural causation (with implications for the question of miracles); the careful articulation of divine attributes; the distinctive ethical-epistemological positions (especially Muʿtazilī rational morality and Ashʿarī revelation-dependent morality, see related Maslik 3 articles).

From falsafa: the contingency argument and its development through Ibn Sīnā to Aquinas, Maimonides, and Leibniz; the analysis of essence and existence; the sophisticated treatment of prophecy in cognitive- metaphysical terms (which fed into Ibn Khaldūn's prophetology, see ibn-khaldun-on-prophecy); the systematic Aristotelian-Neoplatonic metaphysics.

The framework does not require choice between the two. Most contemporary philosophy of religion can be enriched by engagement with both, and the framework's cumulative approach allows the resources of each to function in their appropriate places.

Contemporary Reception

Western scholarship on kalām and falsafa has expanded significantly since the mid-twentieth century. Harry Wolfson's The Philosophy of the Kalam (1976) was a pioneering systematic treatment. Richard Frank's work on Ashʿarī occasionalism, Frank Griffel's Al-Ghazālī's Philosophical Theology (2009), Peter Adamson's extensive work on early falsafa, Khaled El-Rouayheb's The Development of Arabic Logic (2019), and many others have built a substantial scholarly literature.

Within Anglophone philosophy of religion, William Lane Craig's The Kalām Cosmological Argument (1979) brought one strand of kalām into mainstream contemporary debate. Ibn Sīnā's contingency argument has been engaged by contemporary metaphysicians (notably Joshua Rasmussen). The wider engagement is, however, still pending: a contemporary philosophy of religion fully integrated with the Islamic philosophical-theological tradition remains a project, not an accomplished body of work.

What This Article Establishes

Contributions:

A map of the two major traditions of Islamic philosophical theology, with their internal schools and key figures.
A clear statement of where they diverge and where they converge.
A sense of the historical trajectory (the Ghazālī synthesis and the post-classical blending).
The framework's specific position: engagement with both traditions as resources for Maslik 1.

Limits:

The article does not adjudicate every disputed point between kalām and falsafa. Individual companion articles develop specific arguments.
The article does not claim either tradition's positions are simply correct. The framework's epistemic restraint applies.

Connections to Other Masalik

Maslik 1 (this maslik): companion to ghazali-tahafut-and-causation, ibn-sina-necessary-being, and divine-attributes-and-the-coherence-of-theism.
Maslik 4 (Innate Religious): the kalām tradition's discussions of natural theology connect to the fiṭra doctrine. See fitra-doctrine-in-islam.
Maslik 5 (Prophetic): falsafa's prophetology fed into Ibn Khaldūn. See ibn-khaldun-on-prophecy.
Maslik 6 (Textual): both traditions developed accounts of revelation and the Qurʾan. See wahy-and-its-modes.

Key Distinctions

Kalām (defensive-doctrinal) vs. Falsafa (autonomous-philosophical) — their broad orientations
Within kalām: Muʿtazila vs. Ashʿariyya vs. Māturīdiyya
Within falsafa: Kindī vs. Fārābī vs. Ibn Sīnā vs. Ibn Rushd
Demonstration (burhān) vs. dialectic (jadal) as methodological commitments
Pre-Ghazālī tension between kalām and falsafa vs. post-Ghazālī blending

Major Proponents

al-Ashʿarī — al-Ibāna and other works (Ashʿarī)
al-Bāqillānī — al-Tamhīd (Ashʿarī)
al-Juwaynī — al-Irshād (Ashʿarī)
al-Ghazālī — Tahāfut al-Falāsifa, al-Iqtisād
al-Rāzī — al-Maṭālib al-ʿĀliya (post-classical blend)
al-Māturīdī — Kitāb al-Tawḥīd (Māturīdī)
al-Qāḍī ʿAbd al-Jabbār — al-Mughnī (Muʿtazilī)
al-Kindī — Rasāʾil (early falsafa)
al-Fārābī — al-Madīna al-Fāḍila
Ibn Sīnā — al-Shifāʾ, al-Najāt, al-Ishārāt
Ibn Rushd — Tahāfut al-Tahāfut, Faṣl al-Maqāl

Modern Scholarly Engagement

Harry A. Wolfson — The Philosophy of the Kalam (1976)
Richard M. Frank — multiple works on Ashʿarī kalām
Frank Griffel — Al-Ghazālī's Philosophical Theology (2009)
Peter Adamson — Al-Kindī (2007); Philosophy in the Islamic World (2016)
Khaled El-Rouayheb — The Development of Arabic Logic (2019)
Oliver Leaman and Seyyed Hossein Nasr (eds) — History of Islamic Philosophy (2 vols.)
Robert Wisnovsky — Avicenna's Metaphysics in Context (2003)