Hume questions 1

I'm teaching a Hume seminar this Summer, hoping to both get to know Hume better and to help a small number of advanced BA students learn about his philosophy. I'll use this space to post questions that the first Enquiry raises (as well as the corresponding discussions in book I of the Treatise) as well as blog my way through some of the issues he explores there.

Re section 1, Of the different species of philosophy. Some questions: 

01 A reasonable being versus an active being: what is the distinction supposed to consist in?

02 Is philosophy that is clear to the ordinary person to be preferred to philosophies that aren't?

03 When Hume says "man," does he mean what we mean when we say "human"?

04 What makes a philosophy racist or sexist? How could one tell if it was either?

Re section 2, Of the origin of ideas. Some questions:

01 What does vividness in a mental operation show?

02 What sense impression corresponds to "minus"? "If"? "Could have been"? (If we say that imagination supplies that, how do we account for the truth value of the resulting proposition--especially in counterfactual cases ("The Rangers could have beaten the Penguins; then they'd be playing the Lightning in Game 7 tonight")?)

More from time to time.