Much of social science has been built as a citadel against metaphysics and politics. Faithful to the outlook produced by the modern revolt against ancient philosophy, the classic social theorists were anxious to free themselves first from the illusions of metaphysics, then from the seeming arbitrariness of political judgments. They wanted to create a body of objective knowledge of society that would not be at the mercy of philosophical speculation or political controversy, and, up to a point, they succeeded. But now we see that to resolve its own dilemmas, social theory must again become, in a sense, both metaphysical and political. It must take a stand on issues of human nature and human knowledge for which no "scientific" elucidation is, or may ever be, available. And it must acknowledge that its own future is inseparable from the fate of society.