A Treatise of Human Nature

What is this book about?

Starting from empiricism and scepticism, Hume examines human understanding, the passions, and moral psychology. All knowledge derives from sensory experience, he argues, while causation contains no logical necessity — it is only a habit the mind forms after repeated observation. Its three books treat understanding, the passions, and morals, and it is among the most influential works of modern philosophy. It is also, for all its technical difficulty, written with unusual clarity.

Why read it?

It is the sceptical critique that shattered Kant's "dogmatic slumber": Hume does not deny that we use causation, he asks what entitles us to. That question forced Kant to respond and set off a lasting re-examination of the foundations of science and the limits of reason. You finish it more suspicious of what passes for common sense.

Core Ideas

• All knowledge derives from sensory experience; beyond experience there is no reliable knowledge.
• Causation is only a psychological habit of the human mind and contains no logical necessity.
• Both the human mind and morality rest on perception and habit.
• Because causal necessity cannot be proved, later thinkers were pushed to re-examine the foundations of science and the limits of reason.

What questions does this book try to answer?

• How are the human mind and morality built upon perception and habit?
• On what grounds do we believe in causation, rather than mere mental habit?
• If all knowledge comes from experience, how far can reason reach?

Who should read it?

For readers interested in empiricism and cognitive psychology — and for anyone tracing the roots of Kant, the philosophy of science, or behavioural science. The prose is clear, but the arguments are close-packed and demand patience.

How to Read It

The source list's reading angle: because causal necessity cannot be proved, later thinkers were pushed into a deep re-examination of the foundations of science and the limits of reason. Start with the central argument that causation comes from habit. The book first appeared in 1739; the standard Chinese translation is Guan Wenyun's. Hume himself rewrote the material as the far more readable Enquiry Concerning Human Understanding, which makes a good warm-up.