In "Capital: Critique of Political Economy" (1867), Karl Marx's mention of Vico indicates their parallel perspectives about history, the role of historical actors, and an historical method of narrative. Marx and Vico saw social-class warfare as the means by which men achieve the end of equal rights; Vico called that time the "Age of Men". Marx concluded that such a state of affairs is the optimal end of social change in a society, but Vico thought that such complete equality of rights would lead to socio-political chaos and the consequent collapse of society. In that vein, Vico proposed a social need for religion, for a supernatural divine providence to keep order in human society.