For 10 points, name this Scottish philosopher who wrote An Enquiry Concerning Human Understanding.
This philosopher advocated defining a complex idea by breaking it down into simple ideas and tracing each of the simple ideas to the impressions from which they are derived, a method based on the "copy principle." One principle named for him divides statements into relations of ideas and matters of fact, and another states that you cannot get an "ought" from an "is." In addition to his namesake "law" or "guillotine" and "fork," he authored A Treatise of Human Nature. For 10 points, name this Scottish philosopher who wrote An Enquiry Concerning Human Understanding.
This philosopher advocated defining a complex idea by breaking it down into simple ideas and tracing each of the simple ideas to the impressions from which they are derived, a method based on the "copy principle.
David {Hume}