The Incoherence of the Incoherence

Quick Facts

• Title: The Incoherence of the Incoherence
• Arabic title: Tahafut al-Tahafut, usually translated as "The Incoherence of the Incoherence" or "The Refutation of the Refutation"
• Author: Ibn Rushd, known in Latin Europe as Averroes
• Date: around 1180
• Main target: al-Ghazali's The Incoherence of the Philosophers
• Main issue: whether philosophy can give real knowledge about God, nature, and the world without contradicting Islam
• Traditions: Islamic philosophy, Aristotelianism, Averroism

The Problem

Al-Ghazali had argued that the philosophers claimed more certainty than they really had. In The Incoherence of the Philosophers, he attacked the Muslim Aristotelians and Avicennans on twenty issues. Three were especially dangerous in his view: the claim that the world has no first moment in time, the claim that God does not know individual events in the ordinary way, and the denial of bodily resurrection.

Ibn Rushd answers that this attack damages more than a few technical doctrines. If al-Ghazali is right, then philosophy cannot securely explain nature, cause and effect, or God's relation to the world. For Ibn Rushd, that result is unacceptable. The world is ordered. Human reason can study that order. Revelation and sound demonstration cannot finally clash, because truth cannot fight truth.

The book is therefore not just a defense of "Greek philosophy" as a foreign hobby. It asks a sharper question: when a trained philosopher, a theologian, and a scripture reader disagree, how should truth be tested? Ibn Rushd's answer is that each kind of argument has a proper level. Demonstration gives strict proof. Dialectic gives strong debate from accepted opinions. Rhetoric persuades ordinary hearers. Trouble starts when theologians use dialectical arguments and treat them as if they were demonstrations.

In One Minute

The Incoherence of the Incoherence is Ibn Rushd's long reply to al-Ghazali. Al-Ghazali had tried to show that the philosophers were internally inconsistent. Ibn Rushd tries to show that al-Ghazali's attack is the incoherent one.

The center of the book is a defense of demonstrative philosophy. A demonstration is a proof built from true, necessary premises, not just a clever argument. Ibn Rushd thinks Aristotle's method gives philosophy its best model: start from the nature of things, explain their causes, and do not confuse popular persuasion with strict proof.

The most famous issue is causality. Al-Ghazali says we never see fire necessarily cause cotton to burn; we only see burning happen after contact with fire, while God creates each event. Ibn Rushd answers that if things had no stable natures, knowledge would collapse. Fire burns because of what fire is. Medicine works because bodies have regular powers. God can still be the ultimate cause of the whole order, but the order itself must be real.

The Main Argument

Ibn Rushd's main argument has four parts.

First, philosophy is legitimate when it uses demonstration. Demonstration is not guessing, wordplay, or public preaching. It is the strictest form of reasoning available to human beings. If someone proves a conclusion this way, that conclusion cannot be false.

Second, revealed religion cannot contradict demonstrated truth. If a scriptural passage seems to conflict with a proven conclusion, Ibn Rushd thinks qualified interpreters should read the passage figuratively. This kind of interpretation is called ta'wil. It does not mean twisting the text to fit any theory one likes. It means that when proof is genuinely decisive, the outward wording may point to a deeper meaning.

Third, al-Ghazali often attacks a weakened version of philosophy. Ibn Rushd thinks al-Ghazali mixes Aristotle with later Neoplatonic and Avicennan claims, then blames philosophy as such for problems that belong to those later systems. Ibn Rushd also thinks al-Ghazali uses dialectical objections: arguments that may unsettle an opponent, but do not actually prove the opposite view.

Fourth, nature must be intelligible. Things have real features that explain what they do. If fire, water, bodies, animals, and stars have no stable causal powers, then science becomes impossible. A doctor could not explain why a medicine usually cools a fever. An astronomer could not explain regular motion. A judge could not reason reliably from evidence. Ibn Rushd thinks al-Ghazali's occasionalism, the view that God directly creates each event without real creaturely causes, makes the world too arbitrary to know.

This does not make Ibn Rushd a simple secular rationalist. He still thinks God is the first cause of the whole order. His point is that God's wisdom is shown through an ordered world, not through a world where every connection is merely apparent.

Key Ideas With Examples

Incoherence means internal breakdown. Al-Ghazali claimed that the philosophers' own ideas clash with one another. Ibn Rushd answers by trying to show that al-Ghazali's objections clash with good reasoning, stable nature, and careful interpretation.

Demonstration means strict proof. In an Aristotelian setting, a demonstration explains why something must be so. A geometry proof is the easiest example: if the premises are true and the reasoning is valid, the conclusion follows. Ibn Rushd wants metaphysics and natural philosophy to aim at this level where possible.

Dialectic means argument from accepted opinions. It can be useful in debate, but it does not always give certainty. For example, "most respected teachers say this" may be a serious reason to listen, but it is not the same as a proof. Ibn Rushd thinks many theological arguments work at this level and should not overrule demonstration.

Causality means that things really do produce effects because of what they are. Fire heats. A sharp knife cuts. Food nourishes. These are not random pairings that only look regular. Ibn Rushd thinks each thing has a nature, meaning a built-in way of acting and being acted on. Without natures, words such as "fire," "medicine," and "human body" lose clear meaning.

Occasionalism is the view that created things do not truly cause events; God creates each event directly on each occasion. In the famous fire-and-cotton example, the occasionalist says fire does not really burn cotton. God creates the blackening and separation of the cotton fibers when fire is present. Ibn Rushd objects that this removes the basis of science. If fire has no real power to heat, then we no longer know what fire is.

Eternity of the world means that the world has no first moment in time. It does not mean the world is independent of God. Ibn Rushd argues that an eternal world can still depend on God the way an eternal effect depends on an eternal cause. The hard issue is not whether God creates, but whether creation must mean a first instant after absolute nothing.

Divine knowledge means God's knowing of the world. Al-Ghazali worries that the philosophers make God too distant from individual events. Ibn Rushd replies that God does not know things the way we do. We learn from events after they happen. God knows the world as its cause. A builder knows a house by planning and making it, not by discovering it later as a stranger would.

Bodily resurrection means the return of embodied human life after death. Al-Ghazali treats denial of bodily resurrection as a grave religious error. Ibn Rushd is careful here. He thinks religion teaches resurrection, but he also thinks public teaching must respect the level of the audience. Not every difficult question about the soul and body should be thrown into public controversy.

How The Work Is Built

The book is built as a running reply. Ibn Rushd quotes al-Ghazali's arguments and then answers them. This makes the text feel less like a neat textbook and more like a courtroom exchange. Al-Ghazali raises the charge; Ibn Rushd cross-examines it.

The order largely follows the problems in The Incoherence of the Philosophers. The opening discussions focus on whether the world is eternal or created in time. Later sections turn to God's attributes, God's knowledge, causality, the soul, and resurrection.

The structure matters because Ibn Rushd is not only stating his own position. He is testing whether al-Ghazali has met his own standard. If al-Ghazali says the philosophers lack demonstration, Ibn Rushd asks whether al-Ghazali's counterarguments are demonstrative. Again and again, his answer is no.

The style also preserves the conflict between three voices: the philosopher who wants strict proof, the theologian who defends religious doctrine through debate, and the believer who receives truth through revelation. Ibn Rushd wants these voices ordered, not blended into confusion.

Why It Matters

The Incoherence of the Incoherence is one of the clearest medieval defenses of philosophy as a disciplined search for truth. It says that reason is not an enemy of religion when reason is used properly. It also says religion is not a rival theory of physics. Each has its proper audience, language, and method.

The book matters for the history of causality. Ibn Rushd gives a forceful answer to the view that regular natural connections are only habits God happens to maintain. His reply helped keep alive an Aristotelian picture of nature as ordered by real causes.

It also matters for the reception of Aristotle. In Latin Europe, Averroes became "the Commentator," a major guide to Aristotle for medieval scholastic thinkers. The book's defense of demonstration fed later disputes about philosophy, theology, and the limits of interpretation in Scholasticism.

For Islamic Falsafa, the work is a major defense after al-Ghazali's attack. It did not simply erase al-Ghazali's influence. But it made the philosophical answer as sharp and memorable as the attack.

Proponents, Critics, and Opponents

Ibn Rushd is the defender of Aristotelian philosophy in this debate. He argues that philosophy is required for those capable of demonstration, because studying the order of beings leads the mind toward the creator of that order.

al-Ghazali is the direct opponent. He is not simply anti-reason. His challenge is subtler: he says the philosophers claim demonstrative certainty in metaphysics but often rely on assumptions they have not proved. Modern readers often take this side of al-Ghazali more seriously than Ibn Rushd did.

Aristotle is the main philosophical authority behind Ibn Rushd's answer. Ibn Rushd thinks a purified Aristotelian philosophy can explain nature, causality, and the first cause better than the mixed systems attacked by al-Ghazali.

Islamic Falsafa is the broader tradition being defended. The work argues that philosophical inquiry can belong inside Islamic intellectual life when it is handled by qualified thinkers.

Scholasticism receives Ibn Rushd mostly through Latin Averroism and later debates over Aristotle. Many Christian scholastics used him, argued with him, or treated him as a powerful but dangerous interpreter.

Related Pages

• Ibn Rushd
• The Incoherence of the Philosophers
• al-Ghazali
• Aristotle
• Islamic Falsafa
• Scholasticism