 In his attempt to classify emotions with the help of Aristotle’s physical theory of movements, Aquinas distinguishes between two types of the contraries of movements: the approach to something and retreat from it, and movements associated with contrary endpoints. The contrary movements of the concupiscible power are of the second type, towards contrary ends (sense-good and sense-evil). The contrary movements of the irascible power are of the first type, with respect to the same objects.