1711–1776 · Edinburgh, Scotland
"Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them." — A Treatise of Human Nature (1739)
David Hume was a Scottish philosopher, historian, economist, and essayist who ranks among the most influential figures of the Western intellectual tradition. A central figure of the Scottish Enlightenment, Hume developed a rigorous empiricist philosophy that challenged rationalist metaphysics and laid groundwork for modern philosophy of mind, epistemology, and ethics. His skeptical approach to causation, induction, and the self continues to shape debates in philosophy and the sciences today.
We cannot justify inductive reasoning (inferring the future from the past) by appeal to experience without circularity. Past regularities do not logically guarantee future ones—yet we cannot do without induction.
Moral conclusions (what ought to be) cannot be derived from purely factual premises (what is). This "naturalistic fallacy" has shaped metaethics ever since.
The self is not a persistent substance but a "bundle" of perceptions. When we introspect, we find only particular impressions and ideas—never a unified, enduring self.
All ideas derive from impressions (lively perceptions). Complex ideas are combinations of simple ones. "No idea without a prior impression" limits the scope of meaningful thought.
We never perceive necessary connection between cause and effect—only constant conjunction. Causation is a habit of the mind, not a feature of the world we observe.
Testimony for miracles is always outweighed by the uniform experience against them. A wise person proportions belief to the evidence; miracles, by definition, violate natural law.
Hume embodied the Enlightenment ideal of applying reason and empirical inquiry to human nature. He was a close friend of Adam Smith and influenced the French philosophes. His emphasis on sentiment in ethics, his critique of religious dogma, and his commitment to moderate skepticism placed him at the heart of 18th-century intellectual life—though his irreligious reputation often barred him from academic positions.
Hume's influence extends across philosophy, psychology, economics, and political theory. Kant credited Hume with awakening him from "dogmatic slumber." His problem of induction remains central to philosophy of science. His moral sentimentalism prefigures modern virtue ethics and evolutionary psychology. Contemporary debates about free will, personal identity, and the limits of reason still engage with Humean arguments.
"Be a philosopher; but, amidst all your philosophy, be still a man." — An Enquiry Concerning Human Understanding (1748)