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A Treatise of Human Nature
David Hume’s *A Treatise of Human Nature* is a landmark empirical philosophy work that upends traditional views of human cognition, emotion, and morality. Starting with a rigorous breakdown of perception—distinguishing vivid "impressions" (sensory experiences, raw emotions) from faint "ideas" (mental reflections)—Hume argues all simple ideas originate from corresponding impressions, rejecting innate knowledge claims. He redefines causality not as an objective law, but as a mental habit forged by repeated event associations. For emotions, he explains pride, humility, love, and hate through dual links of ideas and shared impressions. Finally, Hume anchors morality in sentiment rather than reason: moral judgments stem from feelings of pleasure or pain, shaped by humanity’s innate capacity for sympathy. Alongside this, he explores skepticism about rational certainty, challenging reason’s supposed primacy in human life and laying groundwork for modern empirical psychology and ethics.
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