Reason and emotion are often cast as opposites. Yet emotion comes in a wide array of manifestations and has a variety of relations with its supposed opposite. Understanding emotion better is key to grasping how jurisprudence casts the relation between psychology and judicial decision making. Jurisprudents disagree on whether and when (lack of) emotion is a problem for decision makers in the justice system. The aim of this paper is to shed light on unarticulated assumptions in mainstream legal theory concerning (...) this disagreement. The paper plots the different positions jurisprudents hold concerning the role of emotion in judicial decision making, regardless of where they stand on matters such the nature of law. The paper substantiates the claim that legal theorists often take an irrationalist approach to emotion but occasionally develop an alternative account that is closer to a cognitivist approach, the prime example of which is the claim that equity requires practical reasoning. Emotions are then cast as skills to be appreciated. The paper concludes that jurisprudence adopts a simplistic view of emotion. The study of the role of emotion has been hampered by the tendency to view emotions reductively. My classificatory effort warrants the conclusion that lack of emotion – understood as a skill in cognitivist terms – constitutes a problem for justice. (shrink)