An Enquiry Concerning Human Understanding · Chapter
Of Liberty and Necessity explained
Hume argues that the idea of necessity arises from the constant conjunction of similar objects and the mind's inference from one to the other, and that this same necessity applies to human actions and motives.
What happens
Hume argues that the idea of necessity arises from the constant conjunction of similar objects and the mind's inference from one to the other, and that this same necessity applies to human actions and motives. He reconciles liberty and necessity by defining liberty as the power to act according to the will, not as a lack of causation, and contends that both doctrines are consistent with morality and essential to it.
Themes in this chapter
Liberty and Necessity
Central theme: Hume reconciles liberty (as power to act according to will) with necessity (as constant conjunction and inference), arguing they are compatible and essential to morality.
Causation and Necessary Connection
Hume argues that our idea of necessity arises solely from constant conjunction and mental inference, not from any observable power in objects.
Human Nature and Uniformity
Hume emphasizes the uniformity of human nature across time and place, using history to discover constant principles of action.
Characters to notice
- Narrator
Presents the philosophical argument reconciling liberty and necessity, analyzing human motives and actions.
- Quintus Curtius
Cited as an example of a historian whose veracity is doubted when describing supernatural events.
- Alexander the Great
Mentioned in the context of Quintus Curtius's description of his supernatural courage and force.
Key passages
“Our idea, therefore, of necessity and causation arises entirely from the uniformity observable in the operations of nature, where similar objects are constantly conjoined together, and the mind is determined by custom to infer the one from the appearance of the other.”
Our concept of necessity and causation comes solely from seeing similar events regularly paired and from habitually inferring one from the other.
Hume's core empirical argument that necessity is not observed in objects but is a mental habit.
“By liberty, then, we can only mean a power of acting or not acting, according to the determinations of the will; that is, if we choose to remain at rest, we may; if we choose to move, we also may.”
Liberty is simply the ability to act or not act as we will, not freedom from causation.
Hume's definition of liberty as compatible with necessity, distinguishing it from chance.