This article sheds light on some of the gaps in John Rawls's book A Theory of Justice. It is a summary of Rawls's later lectures which he collected in his book Political Liberalism. As Rawls mentions, the numerous critiques and responses to his theory of "justice as fairness" that he summarised in his 1971 book A Theory of Justice, a were a  reverberation of an idea he wrote about in 1958 in an article entitled "Justice as Fairness", and they actually helped him to develop and clarify his theory of justice as a political conception that applies to the basic structure of a well-organised society in the context of a constitutional democracy.