Faṣl al-Maqāl (The Decisive Treatise)
Averroes's defence of the legitimacy of philosophy within Islamic law
Tradition: Medieval Islamic philosophy / Andalusian Peripatetic falsafa
Philosophy and scripture are two paths to the same truth — when they appear to conflict, the scriptural text requires allegorical interpretation
The Decisive Treatise is Averroes's most influential short work and one of the central documents of medieval Islamic philosophical theology. Written as a legal argument (using the formal vocabulary of Islamic jurisprudence), it defends three theses: that philosophical study is permitted, even obligatory, for those capable of it; that scripture and demonstration cannot in principle conflict because both teach the truth; and that when the apparent meaning of scripture contradicts demonstrative reasoning, the apparent meaning must be interpreted allegorically (taʾwīl). The work has been read as the founding text of medieval Islamic rationalism and (via its Latin translation) of the Latin Averroist tradition condemned at Paris in 1277. Modern political philosophy (Strauss, Butterworth) has read the Treatise as a model of philosophical communication under conditions of orthodoxy.
Author
Editions cited
- The Decisive Treatise (Charles Butterworth, Brigham Young, 2008, parallel Arabic-English)
- On the Harmony of Religion and Philosophy (George F. Hourani, Luzac, 1961)
- Averroes' Decisive Treatise (Massimo Campanini, ed., 2007)
School Embodiments
The Decisive Treatise is one of the most rigorous defences of Islamic philosophical rationalism. Averroes's position became the paradigmatic Andalusian Peripatetic stance.
"Truth does not oppose truth; rather, it agrees with it and bears witness to it." (Decisive Treatise, opening argument)
Aquinas engaged Averroes's positions extensively (both adopting and rejecting them). The Latin Averroist tradition — condemned in 1277 — derives partly from this work.
"The Law calls upon people to use their intellects." (Decisive Treatise, paraphrasing)
Averroes is the medieval-Islamic figure most closely associated with philosophical rationalism. The Decisive Treatise's argument that demonstration cannot conflict with revealed truth is structurally rationalist.
"When a demonstrative conclusion conflicts with the apparent meaning of scripture, the apparent meaning must be interpreted allegorically." (Decisive Treatise)
Maimonides and Averroes were near-contemporaries in Andalusia and shared a common philosophical-jurisprudential method. The Guide of the Perplexed and the Decisive Treatise read as parallel projects across the Jewish-Muslim divide.
"The Law urges philosophical reflection." (Decisive Treatise, opening)
A robust philosophical realism — that there is one truth, that both reason and revelation access it, that the truths can be coordinated — underlies the entire argument.
"All knowledge whose true premises lead to demonstration teaches the truth." (Decisive Treatise, paraphrasing)
A more distant relationship: Averroes's philosophical methodology was not Sufi, but subsequent Islamic philosophical mysticism (Suhrawardī, Mulla Sadra) developed the rationalist-mystical synthesis Averroes's method made conceivable.
"All people of the Law agree that there are demonstrative truths." (Decisive Treatise, paraphrasing)
Internal Tensions
The Latin Averroist tradition's claim of "double truth" (one truth for philosophy, another for revelation) was condemned at Paris in 1277. Modern scholarship (Ernest Renan in the nineteenth century, more recently Charles Butterworth and Richard Taylor) has emphasised that Averroes himself does not hold a double-truth doctrine; the Latin reception simplified his more sophisticated position. The unicity-of-intellect thesis — that there is one shared active intellect for all humans, denying personal immortality — was the most controversial inheritance of Latin Averroism.
I. Time
Standard Aristotelian-Islamic cosmology. The Decisive Treatise does not develop time-theory; it presupposes the framework of the longer Commentaries.
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II. Space
Standard medieval cosmology. Substantival, finite, three-dimensional.
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III. Matter
Hylomorphic; created and conserved by God. The broader Aristotelian framework runs underneath.
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IV. Observer
The Averroean observer is the philosophical Muslim who reaches the truth by demonstration — embodied, plural, active in inquiry. Knowledge is total in principle through conjunction with the active intellect (the doctrine that became controversial in Latin Averroism).
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V. Energy
Not theorised in this short treatise.
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VI. Information
Scripture and demonstration coordinate to provide the substantival informational structure of truth. Personal information is conserved across death; Islamic eschatology is presupposed.
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Personas that cite this work
Personas with the nearest attribute fingerprint
Historical figures whose own classification on the same six-dimensional grid lands closest to this work's. Computed by attribute-agreement on coordinates both address.
Computed school proximity
The work's attribute fingerprint scored against all schools using the same quiz scorer. Useful as a sanity check on the hand-curated embodiments above.
How Faṣl al-Maqāl (The Decisive Treatise) resolves each dilemma
51 resolved positions across 4 dimensions, including 10 distinctive where the majority of schools go the other way · 6 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.
Time · 9 dilemmas · 3 distinctive
Persistence, the future, and the direction of becoming.
6 mainstream positions
Matter · 7 dilemmas, all mainstream
Observer · 37 dilemmas · 5 distinctive
Mind, agency, and the knower's relation to the known.