This Article will explore and compare the philosophical psychologies of John Stuart Mill, Sigmund Freud, and B.F. Skinner, and will survey the socio-political implications of their respective views of human nature. The Article will seek to demonstrate generally that we cannot arrive at a unified vision of the most suitable social and political order without answering fundamental questions concerning what may variously be called human nature, human psychology, or the nature of the self. More specifically, this Article will contend that liberalism is contingent upon the traditional view of the person as free, rational, characterized by a functional psychological unity with an authentic core personality which exists independent of, an...