Dan Robinson gives the second of eight lectures on Reid's Critique of David Hume at Oxford. Is it the case that every simple idea is a "copy" of a simple impression? Hume is but the latest to deny that we have direct access to the external world. This "ideal" theory, relegating ideas to a mental realm whose occupants are but "copies" of some indefinite thing, is the sure path to skepticism. Under "David Hume", the Stanford Encyclopedia of Philosophy begins with, "The most important philosopher ever to write in English". His most formidable contemporary critic was the fellow Scot, Thomas Reid, the major architect of so-called Scottish Common Sense Philosophy. The most significant features of Hume's work, as understood by Reid, are the representative theory of perception, the nature of causation and causal concepts, the nature of personal identity and the foundations of morality. Each of these topics is presented in a pair of lectures, the first summarizing Hume's position and the second Reid's critique of that position.

This has been around for quite a while on Youtube, but it needs a safe place here in the land of free speech.