 Many time-honored principles of classification clearly decreased in importance during the early modern period. In particular, the possibility of psychic conflict, especially that which could generate competing motives for action, had been a common device in ancient and medieval theories for distinguishing among passions, kinds of passions, and faculties of the soul in general. This principle played some role for Descartes in distinguishing between movements coming from the body and those originating in the soul, and it was deployed sporadically by other theorists. But the practice died out over the course of the two centuries, as theorists came to recognize the possibility that a single, or similar, emotional source might produce conflicting motions or tendencies, both in the individual and across societies. Indeed, some emotions were characterized exactly by such conflict or turbulence. Descartes’s description of regret is one such example. A somewhat happier case is the emotions generated by tragedy, as explained by philosophers from Malebranche to Hume.