Supererogation and rules

Abstract

Moral philosophers tend to discriminate, explicitly or implicitly, three types of actions from the point of view of moral worth. First, they recognizeactions that are a duty, or obligatory, or that we ought to perform, treating these terms as approximately synonymous; second they recognize actions that are . .. permissible … but not morally requiredof us . .. ; third . . . actions that are wrong, that we ought not to do.