Free Will & Compatibilism

The Stoics believed every event is fixed by prior causes in an unbroken chain — a position stronger than most modern determinism, since it included a providential order arranging the whole thing. They also held people responsible for their actions, praised virtue, blamed vice, and built an entire ethics on the assumption that how you respond to an impression is up to you.

Critics in antiquity thought this was straightforwardly inconsistent, and produced an argument still in circulation today: if everything is fated, then whether I recover from this illness is fated too, so calling a doctor is pointless. The "lazy argument," they called it. Chrysippus, the school's great logician, answered it, and his answer is the first serious compatibilist position on record.

The cylinder

Chrysippus' image survives through Cicero and Aulus Gellius. Push a cylinder and it rolls; push a cone and it spins in place. The push is the external cause and it is not up to the object. But how it moves is determined by its own shape — and the shape is the object's own.

Applied to action: impressions arrive unbidden — an insult, an opportunity, a fear. What you do with them depends on the state of your mind, and that state is yours, formed by your own past assents. The chain of causation is unbroken, and it passes through your character rather than around it. That is the sense in which the act is up to you.

The lazy argument fails because it assumes fate operates around your choices. It does not; it operates through them. Whether you recover may be co-fated with whether you call the doctor, and calling the doctor is one of the causes. Nothing about universal causation makes deliberation idle, because deliberation is one of the things doing the causing.

What "free" was ever supposed to mean

The dispute since has largely been about a definition, and stating that plainly is the fastest way through it.

Hard determinism says: every event including your choices is necessitated by prior causes; free will requires that your choices are not necessitated; therefore there is no free will, and desert-based responsibility is unfounded.

Libertarianism, in the metaphysical sense, accepts the same definition and denies the first premise: some choices are genuinely undetermined. Epicurus was the ancestor here, with his atomic swerve — an uncaused deviation that breaks the chain, introduced precisely to make room for agency.

Compatibilism rejects the shared definition. Freedom, on this view, was never the absence of causes; it is a matter of the right causes. Hume put it crisply: liberty is the power of acting according to the determinations of the will — the man in chains is unfree, the man acting on his own desires is free, and nothing in that distinction requires anything to be uncaused. Frankfurt refined it by asking whether you want the desires you act on: the addict who wishes he did not want the drug and takes it anyway is unfree in a way the person acting on desires he endorses is not.

Seen this way the debate is not primarily about physics. It is about whether "free" in "free will" was doing the job the incompatibilist assumes. The compatibilist's claim is that when we praise, blame, contract and punish, we have always been tracking whether the action flowed from the agent's own character and responded to reasons — never whether it was uncaused.

The part that is not a definition

One thing does not dissolve into semantics: whether anyone deserves to be punished, in the sense of it being intrinsically fitting that a wrongdoer suffer.

Even granting the compatibilist that your character caused the act, you did not author the character from nothing. It came from genes you did not pick, a childhood you did not choose, and circumstances that shaped what you would later find obvious. Push the causal chain back far enough and it leaves the person entirely. This is the basis of the strongest modern anti-desert argument — that basic desert requires being the ultimate source of yourself, which nobody is.

Notice that this does not touch the practical machinery. Deterrence, incapacitation, rehabilitation and the ordinary business of holding people to standards all survive intact, because they justify themselves by consequences and by the fact that agents respond to reasons. What is in question is retribution — the claim that suffering is deserved apart from any good it does. That is a live and consequential dispute, and it is not settled by choosing a definition of "free."

Why the Stoics did not flinch

It is worth returning to why this position was comfortable for them, because it explains what modern compatibilism inherits and what it does not.

The Stoics could be relaxed about determinism because their determinism was benign: the chain of causes is the working of a rational order, so aligning yourself with it is aligning with reason. Your assents are up to you, they are fated, and both are true because your reason is a fragment of the cosmic reason doing the fating. As part 10 argued, that base is exactly what the modern version deletes.

Modern compatibilism keeps the structure — freedom as acting from your own character, unbroken causation, responsibility intact — while dropping the reason for thinking the causal order is anything but indifferent. It is the same building on a removed foundation, which is not necessarily wrong, but is worth knowing when the position is described as ancient wisdom.