This chapter examines how the capability approach has been, and might be, justified as superior to its resourcist competition. It shows that capability theorists assert, while resourcists deny, that a public criterion of social justice should take account of the individual rates at which persons with diverse physical and mental constitutions can convert resources into valuable functionings. The chapter then examines to what extent a resourcist criterion can be sensitive to natural human diversity. It also explores the reasons for and against believing that greater compensatory accommodation of such diversity would to a more plausible public criterion of justice. That the capability approach has done much to advance the discussion of social justice is a great tribute to its foremost champions: Martha Nussbaum and Amartya Sen. Key determinants of quality of life includes distribution within the family, differences in relational perspectives, variations in social climate, environmental diversities and personal heterogeneities.