This essay was a speech pronounced in UNICAMP. It was written for Habermas' brasilian visiting expected at the second semester of the past year. Its unmediate goal was to give some informations about the last Habermas' reflections. Therefore, it tried to insert Habermas' proposal of a "communicative reason" in our days with the generalized irruption of fragmentaries, relativistic and irrationalistic discursive forms (the French "poststruturalism" and the Italian "pensiero debole" are the analysed examples). Without claiming to exhaust a so complex subjet, it also tried to put some questions about the critical-cognitive possibilities of the linguistic turn of Habermas' and Apel's philosophy.
Reason x irrationalism; opacity; "weak thought"; posthistory; poststructuralism; community of communication; the rational-teleological action x communicative action; critic of critical theory