The final section treats the "academical or sceptical philosophy," though the better known sections deal with miracles, the association of ideas, and the idea of necessary connection.  
Section 9 concerns the reason of animals, while the views of Epicurus concerning the gods are defended in section 11, "Of a particular providence and of a future state."  The final section treats the "academical or sceptical philosophy," though the better known sections deal with miracles, the association of ideas, and the idea of necessary connection.  FTP, name this 1748 book, in which David Hume reworked the first part of A Treatise on Human Nature, not to be confused with an essay by Locke.
Section 9 concerns the reason of animals, while the views of Epicurus concerning the gods are defended in section 11, "Of a particular providence and of a future state."  
An Enquiry Concerning Human Understanding