Once this step is taken, it becomes possible to argue in a new way for the rationality of moral considerations. Humans begin with the conviction that justice is a genuine virtue. So a conviction that well-constituted human practical reason operates with considerations of justice means that "taking account of other people in that sort of way" is "how human beings live together." (The thought that this is how they live must be understood in a sense compatible with the fact that actual individuals often do not – just as dentists understand the thought that "human beings have "n" teeth" in a way that is compatible with many people having fewer.) There is nothing incoherent in the thought that practical reasoning that takes account of others and their good might characterize some kind of rational and social animal.