“Dialectical” stands in parentheses because I wish to discuss both authors in terms of a critique of reason as such in addition to specifying the issue in terms of their respective assessments of the dialectic. But I shall first consider how each employs the term “critique.” So my remarks will focus on Critique, Reason and Dialectic in that order. Of course, each topic understandably bleeds into the others. In view of the occasion, I shall conclude with a brief sketch of four milestones along Sartre's way from Being and Nothingness to the Critique.