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Malebranche's Occasionalism: God as the Only True Cause

Peter Adamson explains Nicolas Malebranche's argument that God alone truly causes anything, with bodies and minds serving only as occasions for divine action.

A Stoa brief of an episode from History of Philosophy Without Any Gaps

HoP 489 All Power to Him: Malebranche and Occasionalism

Published 21 min

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The episode belongs to its makers. This page summarizes its arguments in Stoa's words and points to the moments where they are made. Brief updated .

The brief

Peter Adamson lays out Nicolas Malebranche's occasionalism, the view that God alone is a genuine cause of anything that happens, while created things such as fire or human willing are only "occasional causes." The argument turns on a demand borrowed from an earlier source: a true cause must necessitate its effect.

Adamson traces this demand back to the Islamic theologian al-Ghazali, who argued that we never actually observe a necessary connection between an apparent cause, like fire touching cotton, and its effect, like burning. Al-Ghazali used this gap to argue that God could suspend natural regularities and work miracles. Malebranche takes over the same standard but applies it more broadly. Since bodies are nothing but extension, and extension has no inherent connection to force, no body can move another body. And since moving an arm requires knowledge of an intricate chain of physiological events that no one actually has, not even a mind can be said to cause its own bodily motions. Only God, infinite in knowledge and power, meets the standard a true cause requires.

Adamson works through two major objections. Fontenelle argues that Cartesian physics itself requires real causal interaction, since impenetrable bodies colliding must deflect somehow. Malebranche's reply, as Adamson presents it, is that the deflection itself is just God applying general laws, so the objection does not establish genuine bodily causation. Arnauld separately charges that Malebranche's God acts inconsistently, ruling by general laws while also needing to intervene in every particular event. Adamson defends Malebranche here, arguing that God's constant particular volitions can still conform to the general laws God has prescribed for himself, so there is no real tension.

The hardest problem is sin. If God causes everything, is God the cause of evil? Malebranche's answer rests on a passive theory of the will: humans are free only in the sense that they can consent to or decline an apparent good, never in the sense of actively causing anything. This passive liberty, Adamson explains, is enough for Malebranche to preserve moral responsibility without giving created things any real causal power.

The discussion leaves open whether minds can at least cause their own ideas, a question Adamson flags for a future episode on Malebranche's debate with Arnauld.

Strongest arguments

True causation requires necessitating the effect

2:39

Adamson explains that both al-Ghazali and Malebranche hold that a genuine cause must necessitate its effect. Since we can conceive of the apparent cause occurring without the effect following, no worldly thing qualifies as a true cause. This licenses the claim that God alone, who acts with genuine necessity, can be a true cause of anything.

Everyday causal talk does not require strict necessity

3:53

Adamson raises the objection that ordinary causal explanations, such as a joke causing laughter or a fall causing breakage, do not meet the standard of strict necessity yet still seem legitimate. He notes the reply that filling in the complete cause, including all relevant conditions, would restore the necessity, a notion scholastics and Islamic philosophers called the complete cause.

Bodies cannot cause motion because extension has no force

7:24

Adamson presents Malebranche's Cartesian argument that bodies are nothing but extension, and extension alone has no connection to force, so bodies cannot communicate motion to other bodies. Since bodies' motor force is really just the will of God, they cannot pass on a power they never possessed.

Fontenelle's objection and Malebranche's reply

8:31

Adamson presents Fontenelle's argument that Cartesian physics itself implies genuine causal interaction, since impenetrable bodies colliding must deflect somehow. Malebranche's reply, as Adamson explains it, is that the fact of some deflection occurring is simply God applying his general laws, so the objection does not establish real bodily causation.

Minds cannot move bodies because they lack the requisite knowledge

11:23

Adamson lays out Malebranche's argument that moving an arm requires a complex chain of physiological events that the willing subject has no knowledge of and could not deliberately control even with scientific understanding. From this Malebranche draws the general principle that a true cause must know how to produce its effect, which only an infinite being like God possesses.

Arnauld's charge of inconsistency and Adamson's defense

10:15

Adamson presents Arnauld's objection that Malebranche inconsistently claims God acts only by general laws while also having to constantly intervene in every particular motion. Adamson argues this rests on a misunderstanding, since Malebranche holds that God does exercise particular volitions constantly, but these volitions all conform to the general rules God has prescribed for himself.

A passive theory of will preserves freedom without granting causal power

16:00

Adamson explains that Malebranche must reconcile occasionalism with moral responsibility for sin, and locates the exception in the will's ability to form intentions rather than physical motions. Malebranche ultimately argues that willing itself, whether accepting or declining a good, is passive rather than an active causal power, yet this passive liberty is enough to make us free and morally responsible without threatening God's sole causal efficacy.

Disagreements

Fontenelle versus Malebranche on bodily collision

8:31

Fontenelle argues that Cartesian physics itself commits Malebranche to real bodily causation, since impenetrable colliding bodies must deflect somehow. Adamson presents Malebranche's reply that the deflection is simply God's application of general laws, so no genuine causal power in bodies is required to explain it.

Concepts discussed

  • occasionalism The theory that created things are not genuine causes but only occasions on which God directly produces effects.
  • causation The relation by which one thing brings about or produces another.
  • free will The capacity of an agent to choose or will among alternatives in a way that grounds moral responsibility.

Philosophers and works discussed

  • Malebranche
  • al-Ghazali

Questions this episode answers

  • What Al-ghazali's discussion of causation anticipate Hume's skepticism about causal necessity?

    0:13

    Al-Ghazali argued that we never observe a necessary connection between an apparent cause like fire touching cotton and its effect like burning, which resembles Hume's later argument. However, Adamson notes the contexts differ: al-Ghazali used this to argue for the possibility of miracles and held that God causes everything, evident miracles and ordinary events alike, whereas Hume did not draw this theological conclusion.

  • What is Malebranche's argument for occasionalism?

    2:00

    Malebranche holds that a genuine cause must necessitate its effect with true necessity, and since no worldly thing can be shown to necessitate anything, only God, who acts with unlimited power, can be a real cause. Bodies are mere extension with no connection to force, and minds lack the complete knowledge needed to produce even their own bodily motions, so God alone brings about every event, with created things serving merely as occasions.

  • Why does Malebranche think bodies cannot cause motion in other bodies?

    7:57

    Malebranche follows the Cartesian view that bodies are nothing but impenetrable and inelastic extension, which has no inherent connection to force. Since force is required to cause motion and bodies' motor force is really just the will of God, bodies cannot communicate a causal power they never possessed.

  • Why does Malebranche deny that the mind can cause the body to move?

    11:23

    Malebranche argues that moving an arm requires knowledge of an intricate chain of physiological events in the nerves, tendons, and muscles that no one possesses, and even complete scientific knowledge would not let a person deliberately control each tiny motion involved. Since a true cause must know how to produce its effect, and human minds lack this knowledge, only God, who is infinite in knowledge and power, can be the real cause of bodily motion.

  • How did Malebranche respond to the problem that occasionalism makes God the cause of sin?

    15:25

    Malebranche's initial answer is that God does move us even in sinful actions, but he locates human moral responsibility in the will's act of intending rather than in the physical motion that follows. He develops a theory in which willing is passive, a matter of allowing oneself to be drawn toward or declining to pursue a good, yet this passive liberty is sufficient for freedom and responsibility.

  • How did Arnauld and Fontenelle object to Malebranche's occasionalism?

    8:31

    Fontenelle argued that Cartesian physics itself requires some causal interaction between bodies, since impenetrable colliding bodies must deflect somehow, though Malebranche replied that the fact of deflection is simply God's application of general laws. Arnauld charged that Malebranche inconsistently combined a God who acts by general laws with a God who must constantly intervene in particular events, a charge Adamson argues rests on a misreading of what Malebranche meant by general volitions.

Related primary passages

Some things are in our control and others not. Things in our control are opinion, pursuit, desire, aversion, and, in a word, whatever are our own actions. Things not in our control are body, property, reputation, command, and, in one word, whatever are not our own actions.

Epictetus, Handbook 1 Read in context

This is the founding statement of the dichotomy of control, the axis the rest of Epictetus's teaching turns on.

Sources

  1. Epictetus, Handbook Primary text, Stoa library
  2. History of Philosophy Without Any Gaps, HoP 489 All Power to Him: Malebranche and Occasionalism Podcast episode, original episode