An Enquiry Concerning Human Understanding
Hume, David He says knowledge comes from sense impressions, and ideas are a copy, they are less clear and intense than the original impression. The mind brings thoughts via their association, what he calls "a principle of connection." They resemble contiguity, cause, and results. There are two different ways to justify a causal case: relations of thoughts or matters of truth. For example, "This room doesn't have four walls" isn't problematic, the room cou...