In this article I present two possible interpretations of Rawls’s assertion in A Theory of Justice that human beings have a desire to express their nature as free and rational. My reading hinges on different accounts of the Kantian conception of the person and of the Aristotelian principle and its companion effect. According to the first interpretation, this desire is a kind of natural predisposition inherent in all persons irrespective of the society in which they live. It has a universal (...) and ahistorical aspect. The second interpretation sees our free and rational nature as an ideal that we strive to fulfill. This ideal appeals only to citizens of modern liberal democracies and entails a more qualified universalism. I argue that there is strong textual support for both interpretations but the second one is more consistent with the methodological framework of justice as fairness. (shrink)