Subjectivity, for Descartes, emerged when he doubted the veracity of his knowledge. Instead of truth, he counted this knowledge to be inherited myth. Cartesian subjectivity has been helpful for forming a critical education predicated on doubting ideology and hegemony. But Marx indicates a very different kind of knowledge in his analysis of capitalism. This knowledge cannot be doubted because we do not acknowledge it in the first place. For a Marxian critical education a different ground must be found for subjectivity. Psychoanalysis provides the theoretical resources for this subjectivity. Instead of negating the Cartesian project, psychoanalysis represents its advance.