Abstract
This short book divides equally into two parts. In the first half, Gert describes what he calls "common morality"-"the moral system that thoughtful people use, usually implicitly, when they make moral decisions and judgments" ; and in the second part, he justifies it. As set out in the first half of the book, common morality comprises moral ideals, moral rules, and a two-step procedure to decide whether one of the rules can be justifiably violated. The idea behind this test is, roughly, that if one is not sure whether some rule can be broken, one describes the morally relevant features of the proposed act before considering the consequences of all other persons knowing that the violating act is allowed and the consequences of them knowing the act is prohibited. If the former consequences are sufficiently acceptable in comparison to the latter, then violating the rule is justified. In Gert's words: "morality requires that a person never violates a moral rule unless she would be willing for everyone to know that they are allowed to violate the rule in the same circumstances". For me, the strength of Gert's description rests on his-in my mind, correct- assertion that there is not a single correct answer to every moral question. There is agreement on many ethical matters but where there is not, this need not reflect poorly on a theory of morality-there may be more than one correct answer to a moral question. Equally rational people will disagree about the outcome of this second step; some will believe a rule can be violated, others not. This difference explains why morality does not provide uniquely correct answers to every moral question.