In 1956 W. B. Gallie advanced the thesis that certain political concepts, such as that of social justice, are .1 Since then, a considerable literature on the subject has developed, some of it in support of the thesis, some of it in opposition to it.2 W. E. Connolly is a leading supporter of it, and John Gray is a leading opponent of it. However, Connolly's advocacy of it in the second edition of his book is significantly more moderate than that (...) in the first (1974) edition of it. (shrink)