I’m not sure I understood this reading, but Rawls seems to articulate his idea of “justice as fairness” by basing it off of the principles of justice “These principles are to regulate all further agreements; they specify the kinds of social cooperation that can be entered into and the forms of government that can be established. This way of regarding the principles of justice I shall call justice as fairness” (Rawls 199). He also discusses conception of justice which seems to tie into the principles of justice. It is almost as if the conception of justice is a part of the principles of justice “Justice as fairness, begins as I have said, with one of the most general of all choices which persons might make together, namely with the choice of the first principles of a conception of justice which is to regulate all subsequent criticism and reform of institutions” (Rawls 200). I think by this he means that in order for people to have a concept of what justice means, there must be principles of justice that people must follow. If they don’t know the principles of justice then they cannot have a concept of it. He gives many examples as to what his idea of “justice as fairness” is “One feature of justice as fairness is to think of the parties in the initial situation as rational and mutually disinterested” (Rawls 201). I think in order to understand his idea of “justice as fairness” a person has to have a concept of the principles of justice, because this is what he bases his idea off of.
Rawls, John. “A Theory of Justice.” A World of Ideas: Essential