Hume divides all 'perceptions' (i.e. experiences) into 'impressions' and 'ideas'. This theory device gives him a more finely grained account of the operations of the mind than either Locke or Descartes have. Impressions are original 'perceptions of the human mind' which are vivid, forceful, strong or lively. Ideas are the 'faint images' of the original impressions.

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Association of Ideas (handout)

If Descartes is the father of modern philosophy, Hume is the person who gave shape to the contemporary philosophical world. First by querying Descartes' theories about knowledge, and then developing his own modest account of knowledge, and later his theories of ethics and aesthetics.