August Cieszkowski (1814–1894) was a philosopher, economist, social reformer and political activist. As early as 1838 he formulated a daring critique of Hegel, which culminated in the notion of praxis and marked the beginning of the radicalization of the Hegelian school. Throughout the 1840s he participated in the social movement in France with a variety of highly original economic and social schemes. After 1848 he played a key role in Polish politics and elaborated a future-oriented and messianic vision of history that sought to integrate Hegel and Christianity. The publication of this volume in 1979 formed part of a revival of interest in Cieszkowski, which centred about his influence on Marx as well as his impact on Herzen, Hess and Proudhon. It also focused on Cieszkowski's position within the broad current of nineteenth-century Polish and European messianism as well as on the originality of his peculiarly non-revolutionary system.