Hume is often thought of as a skeptic. We will consider whether this description of his philosophy is accurate or whether there is something more to it. Hume is a more consistent empiricist than Locke and a more rigorous thinker. His views also seem less idiosyncratic than Berkeley's. I hope that you find reading him compelling, even if troubling.
Hume distinguishes ideas from impressions.
Hume discusses the idea of power or necessary connection in Section VII of the Enquiry .