Abstract

In Opticks, Newton notes that by following the method of analysis and synthesis, ’the bounds of moral philosophy will also be enlarged’. Hume’s Treatise fulfills this vision, albeit with significant caveats. The chapter argues: 1) Hume’s affinity with Newton is primarily methodological, and Hume’s project is closer to the Queries of Opticks than to the Principia. 2) For Hume, moral philosophy is an experimental study of moral beings qua moral beings which results in ‘an anatomy of the mind’ embodying an epistemic ideal closer to Scottish philosophical chemistry than to any kind of mechanical philosophy. 3) Hume primarily inquires into qualitatively different active principles of human nature that explain why humans function as they do. 4) The knowledge that Hume’s project offers can be used normatively. 5) Thus, in Hume’s hands the boundaries of moral philosophy are enlarged. Yet, being entirely secular, it was not what Newton had envisioned.