Aristotle
384–322 BC · Ancient Greek
The will is not a separate faculty but rational desire cooperating with practical reason.
Aristotle does not isolate the will as a distinct power of the soul. The term most often rendered as "will" in his writings, boulesis, means rational wish or desire for the good. What concerns him is less an inner faculty that commands action than the structure of voluntary choice. In Book III of the , he distinguishes the voluntary from the involuntary: an action is voluntary when the agent knows the relevant circumstances and the origin of the action lies in the agent. Actions done under compulsion or through ignorance fall outside the scope of moral assessment. This framework does not require a metaphysics of free will. It requires only that one can distinguish agents who act from knowledge and from an internal principle from those who do not. The related questions of necessity, compulsion, and chance are taken up more fully under those ideas.
The central notion is prohairesis, deliberate choice. Choice is neither mere desire nor mere opinion; it is deliberate desire for things in our power. We deliberate about means, not ends. We wish for health, but we choose the regimen. Deliberation works backward from the end to the first step we can take, and choice is the verdict of that deliberative process. Aristotle thus binds willing tightly to reasoning: to choose is already to have thought through what to do, and the person of practical wisdom is the one whose desires are aligned with sound deliberation. In the treatise On the Soul, appetite is treated as the generic faculty of originating local movement, while wish is assigned to the calculative reason and desire and passion to the irrational part. What later writers call will appears here as a mode of appetite informed by thought rather than as a faculty standing apart from both.
For Aristotle, then, willing is always embedded in character. The temperate person wills temperately not by overriding desire with a separate power but because desires have been trained to accord with reason. The akratic person, who acts against better judgment, presents a difficulty precisely because the expected unity of reason and desire has broken down. Aristotle treats this as a failure of practical knowledge, not as a defect in some independent power of willing. The account is organic: reason and desire work together, and the moral virtues are habits that make that cooperation reliable. The distinction between voluntary motion and the non-voluntary motions of the bodily organs, later refined by physiologists from Harvey to William James, already appears in outline when Aristotle separates actions that proceed from knowledge and desire from those that do not.
"Choice will be deliberate desire of things in our own power; for when we have decided as a result of deliberation, we desire in accordance with our deliberation."
"The origin of action—its efficient, not its final cause—is choice, and that of choice is desire and reasoning with a view to an end."
Aristotle leaves to the tradition a power of choosing woven into practical reason and trained desire, not yet the separate faculty that Augustine and the later scholastics will treat under the name of will. The Augustinian analysis of a divided will, and the Thomistic account of will as rational appetite, both take their bearings from this earlier integration of desire and deliberation.
Key work: Nicomachean Ethics