An Enquiry Concerning Human Understanding (excerpt)
(engl.)
at Marxists Internet Archive
[www.marxists.org/reference/subject/philosophy/works/en/hume.htm]

Of the Dignity or Meanness of Human Nature (excerpt)
(engl.)
at Fordham University
[www.fordham.edu/halsall/mod/hume-dignity.html]

Treatise of Human Nature (excerpt: Book 1)
(engl.)
at Early Modern Philosophy
[www.earlymoderntexts.com/pdfbits/htb.html]