Occasionalism

Quick Facts

• Name: Occasionalism
• Main claim: God is the only real cause, or the only real cause in some domain.
• Main regions: medieval Islamic theology and early modern Europe.
• Main settings: Ash'ari kalam, Cartesian metaphysics, philosophy of religion.
• Main problem: what makes cause and effect happen.
• Famous examples: fire and cotton, body and mind, a person willing an arm to move.
• Major names: al-Ghazali, Nicolas Malebranche, Arnold Geulincx, Geraud de Cordemoy, and sometimes George Berkeley.

The Big Question

When one event follows another, what actually makes the second event happen?

Common sense says fire burns cotton, a hand moves a cup, and a wound causes pain. Occasionalists challenge that. They ask whether created things really contain the power to produce effects, or whether they are only regular signals for God's action.

In One Minute

Occasionalism is the view that created things do not truly cause effects on their own. A match does not, by its own power, make paper burn. Your will does not, by its own power, move your arm. These events are "occasions" for God to produce the next event.

The view appears in two major settings. In Ash'ari Islamic theology, it protects God's freedom and explains miracles by denying that nature has necessary powers independent of God. In early modern Europe, especially after Rene Descartes, it answers the mind-body problem: if mind and body are radically different kinds of thing, God coordinates their apparent interaction.

Occasionalism does not usually mean that the world is random. Most occasionalists say God acts according to stable patterns. What we call laws of nature are the regular ways God acts.

Main Ideas

• God is the real cause. A real cause is what actually produces an effect. For full occasionalists, only God does this.
• Created things are occasional causes. An occasional cause is not a producer. It is the event on which God produces another event. Fire touching cotton is the occasion for God to create burning.
• No necessary connection between created events. A necessary connection is a link that could not fail. Occasionalists deny that fire must, by its own nature, burn cotton.
• Natural laws are regular divine action. Nature looks orderly because God usually acts in consistent ways, not because things have independent causal power.
• The scope can vary. Global occasionalism denies causal power to all created things. Local occasionalism denies it only in a specific area, such as mind-body interaction.

How It Works

Start with an ordinary case: fire touches cotton and the cotton burns. An Aristotelian or Avicennian philosopher may say the fire has a nature or power that makes burning follow. An occasionalist says we observe the sequence, but we do not observe an inner necessity forcing the effect.

The occasionalist account is simple. God creates the fire, the cotton, the contact, and the burning. Fire is still important, because God regularly creates burning when fire contacts dry cotton. But the fire is not the ultimate producer. It is the occasion.

This also explains miracles. If causal links in nature are necessary, then even God could not make fire fail to burn without breaking the order of things. Occasionalists reject that worry. God can act otherwise because the natural order depends on God's will in the first place.

In early modern philosophy, the same structure was used for the mind-body problem. Descartes described mind as thinking and unextended, and body as extended in space. Critics asked how a thought could push matter, or how matter could produce a sensation. Malebranche answers: it does not. When I decide to raise my arm, God moves the arm according to the laws joining mind and body. When my finger is pricked, God gives me the sensation of pain according to those same laws.

The result is not chaos. Malebranche especially insists that God normally acts by general laws. Rain falls, wounds hurt, and bodies move predictably because divine action is regular.

Key Ideas With Examples

• Efficient cause: the thing that actually makes an effect happen. Occasionalists say God is the efficient cause of burning, motion, sensation, and every other effect in the relevant domain.
• Occasion: the created event that marks when God acts. A needle entering skin is the occasion for pain. It is not the producer of the pain.
• Divine omnipotence: God's unlimited power. Islamic occasionalists used the view to protect the idea that God is not trapped by fixed natural necessities.
• Ash'ari kalam: a school of Islamic doctrinal theology. Many Ash'ari thinkers treated the world as radically dependent on God at every moment.
• God's habit: the regular pattern of divine action. In al-Ghazali's famous example, fire usually burns cotton because God habitually creates burning with contact, not because fire forces the result.
• Secondary causality: the idea that created things really cause effects under God. Occasionalists usually reject this, though debates over al-Ghazali ask whether he left some room for it.
• Mind-body interaction: the problem of how mental events and physical events affect each other. Cartesian occasionalists say they do not directly interact. God coordinates them.

Key People

• al-Ash'ari: founder of the Ash'ari school. Later Ash'ari theology became one of the main homes of Islamic occasionalism.
• al-Ghazali: the most famous Islamic figure in the debate. He attacks necessary causal connections in The Incoherence of the Philosophers, especially to defend divine freedom and miracles.
• Louis de La Forge and Geraud de Cordemoy: early Cartesian occasionalists who argued that bodies do not truly cause motion, sensation, or other effects.
• Arnold Geulincx: argued that we cannot truly cause what we do not know how to produce. Since I do not know how my will moves my body, I am not the real cause of that motion.
• Nicolas Malebranche: the central early modern occasionalist. He gives the most systematic version: only God is a true cause.
• George Berkeley: close to occasionalism because he denies causal power to bodies, but he still gives created spirits some activity. He is better treated as a nearby ally than as a simple copy of Malebranche.

Important Works

• The Incoherence of the Philosophers, al-Ghazali: attacks the philosophers' claim that natural causes produce their effects by necessity. The fire-and-cotton discussion became the classic Islamic example for debates about causation, miracles, and God's power.
• Revival of the Religious Sciences, al-Ghazali: a wide religious and ethical work, not just a metaphysics text. Its discussions of trust in God and divine governance show how causal dependence fits into religious life.
• The Search After Truth, Malebranche: Malebranche's main work. It argues that bodies and minds lack true causal power and that natural causes are only occasions for God's action.
• Treatise on Nature and Grace, Malebranche: explains how God acts through general laws. It is important because it shows that occasionalism can support an orderly law-governed nature, not just one-off divine interventions.
• Dialogues on Metaphysics and Religion, Malebranche: presents Malebranche's metaphysics in dialogue form, including his view that only God has the power needed for real causation.
• A Treatise Concerning the Principles of Human Knowledge, Berkeley: denies that bodies have active power and treats sensible things as ideas ordered by God. It is not pure Malebranchean occasionalism, but it belongs near the debate.
• Monadology, Leibniz: rejects both direct interaction and occasionalism. Leibniz says created substances unfold their own states while God harmonizes them from creation.
• An Enquiry Concerning Human Understanding, David Hume: keeps the attack on necessary causal connection but drops the appeal to God as the hidden real cause. Causation becomes a matter of habit, expectation, and observed regularity.

Why It Matters

Occasionalism forces a hard question: when we say one thing causes another, what are we claiming beyond regular sequence?

For Islamic theology, it helped defend God's freedom, miracles, and the dependence of creation. It pushed back against versions of Islamic falsafa influenced by Aristotle, al-Farabi, and Ibn Sina, where natural things have stable powers and effects follow from their natures.

For early modern philosophy, it became one of the great answers to Cartesian dualism. It also helped change how philosophers thought about laws of nature. Instead of hidden powers inside things, laws could be treated as regular patterns.

Proponents, Critics, and Opponents

Proponents include many Ash'ari theologians, al-Ghazali in at least some passages, and early modern Cartesians such as Geulincx, Cordemoy, La Forge, and Malebranche. They agree that ordinary causal talk hides a deeper dependence on God.

Ibn Sina and the philosophers of falsafa defend stronger natural causation. For them, things have natures, and those natures help explain why effects follow.

Ibn Rushd attacks al-Ghazali's critique in The Incoherence of the Incoherence, defending philosophy and the intelligibility of nature.

Leibniz rejects occasionalism because it makes creatures too powerless. His alternative is pre-established harmony: created substances do not interact, but each follows its own inner law in perfect coordination with the others.

David Hume accepts that we do not perceive necessary causal power in objects. But he refuses the occasionalist move to God. We see regular patterns, then the mind forms expectations.

Immanuel Kant answers Hume by saying causation is a basic rule the mind uses to organize experience as an objective world. That is far from occasionalism, but it continues the same debate over necessity, experience, and causation.

Related Pages

• al-Ghazali
• Nicolas Malebranche
• George Berkeley
• Rene Descartes
• David Hume
• Immanuel Kant
• Leibniz
• Islamic Theology
• Islamic Falsafa
• Early Modern Metaphysics
• The Incoherence of the Philosophers