Despite being a character-based rather than an action-based theory, Aristotle does set out some definitive rules. Aristotle thought that there were certain actions that were intrinsically wrong, and these are called base actions. Base actions include theft, adultery and murder. Aristotle believed that they could never be good, because there is no way one could commit adultery well or not well, and there is no way that theft can be committed well or not well, so there can be no excess or deficiency, and therefore the action itself is a base