It is argued that we should distinguish between an ‘early Hume’ and a ‘mature Hume’ on causality. In his early period, represented by the Treatise, Hume had not yet adopted Newtonian active principles. In the mature period, however, represented in particular by the First Enquiry, his theory of causation has been transformed by a reception of Newton. This leads Hume to drop the condition of contiguity, which had excluded action-at-a-distance in the Treatise. It also leads him to allow real necessary (...) connexions in nature which are inaccessible to us just as the real cause of gravitation was thought by Newtonians to be unknown. (shrink)

In the conclusion to the first book of the Treatise, Hume's skeptical reflections have plunged him into melancholy. He then proceeds through a complex series of stages, resulting in renewed interest in philosophy. Interpreters have struggled to explain the connection between the stages. I argue that Hume's repeated invocation of the four humors of ancient and medieval medicine explains the succession, and sheds a new light on the significance of skepticism. The humoral context not only reveals that Hume conceives of (...) skepticism primarily as a temperament, not a philosophical view or system. It also resolves a puzzle about how Hume can view skepticism as both an illness and a cure. The skeptical temperament can, depending on its degree of predominance, either contribute to or upset the balance of temperaments required for proper mental functioning. (shrink)

Do the senses represent causation? Many commentators read Nicolas Malebranche as anticipating David Hume’s negative answer to this question. I disagree with this assessment. When a yellow billiard ball strikes a red billiard ball, Malebranche holds that we see the yellow ball as causing the red ball to move. Given Malebranche’s occasionalism, he insists that the visual experience of causal interaction is illusory. Nevertheless, Malebranche holds that the senses represent finite things as causally efficacious. This experience of creaturely causality explains (...) why Aristotelian philosophers and others struggle to recognize occasionalism’s truth. (shrink)