I think most people understand believing in free will simply as believing that humans are able to make genuine choices. This is entirely unobjectionable.

It is a very different matter to claim that the will is innately unconditionally free. That is what I call voluntarism, and “free will in the strong sense”.

This is different from the way the term “voluntarism” is used in the secondary literature on medieval philosophy. There it means the view that there is a separate faculty for choosing that is called will, and that this will is prior to intellect, in the sense of being able to overrule what our intellect tells us is true or right. In this view, will governs intellect rather than being governed by it. It is in this sense, for example, that Aquinas is called an “intellectualist” and not a voluntarist, because he holds that the will is governed by intellect, even though he also defends liberum arbitrium, or free will in the strong sense. (There is a separate question about how to understand complex views like this, which include contrasting elements. My simple answer is that we should give them the benefit of the doubt.)

Leaving aside the expanded concept of responsibility that Brandom recommends in A Spirit of Trust, I hold that moral responsibility is well explained by Aristotle. Aristotle says we are responsible for all “willing” actions, but not for “unwilling” ones. It really is no harder than that.

In ordinary life, without any philosophy, we already distinguish willing actions from unwilling or unintended ones that happen as a result of coercion or ignorance. These distinctions of willingness from unwillingness apply at the level of particular actions. Some things we do willingly, others we do not.

This distinction between willing and unwilling could not even possibly be a matter of metaphysical or anthropological truth, because metaphysical and anthropological conclusions are both too general to support this kind of distinction. A metaphysical or anthropological account could only give us ways of generalizing about action or human action as such. But we do not have responsibility in particular cases because of some general metaphysical or anthropological truth. Rather, we have responsibility in particular cases because of what is true in those cases.

We should notice that Aristotle’s whole discussion of willing and unwilling actions — and of choice — not only does not assume, but does not even mention a separate faculty called “will”, unless this has been introduced by a translator. Moreover, meaningful discussion of any definite will or intent revolves around its particular content, not its source. Meanwhile, the source of choice is well described by Aristotle as “either intellect fused with desire, or desire fused with thinking, and such a source is a human being” (Nicomachean Ethics, Sachs tr., p.104; see also Free Will in Aristotle?)

People should be broadly forgiven for having been brought up with the pervasive inflated language about free will, even though a more precise analysis shows it is not really needed to explain or justify the claim we want to defend: that humans are able to make genuine choices.

This is true especially because there is a whole family of old (largely 19th-century) clichés about free will and determinism that tend to force discussion of these topics into very narrow channels. “Free will” and “determinism” are commonly taken to be two opposite extremes. Either everything is determined in advance, or nothing is. Then we are told that in order to avoid the evils of a total determinism, the only alternative is to believe that we are not determined at all. This is a false dichotomy.

Historically, it was Augustine who coined the original Latin term liberum arbitrium, and he is often credited with originating the notion of what I call “free will in the strong sense”. Boulnois mentions the commentator Alexander of Aphrodisias (2nd-3rd century CE) as an important precursor.

Theological voluntarism is closely bound up what I have called strong omnipotence, for which the earliest source I know is Philo of Alexandria (1st century BCE to 1st CE). Some form of omnipotence is at least verbally affirmed by nearly all later authorities in all three monotheistic traditions. It is even more pervasive than free will in the strong sense. But again, most of those same authorities make other statements which seem to indicate that they do not at all mean really to endorse the extreme consequences that follow from strong omnipotence, or from free will in the strong sense. We should apply a good measure of interpretive charity in these cases.