An apt thought to assume as task to think and to say the danger that if lodges in the essence of the technique. But as could appear a new form to say and to think to exactly break of this planetary domain of the technique and of this overwhelming impoverishment of the language operated for science and devices technician-informacionais? Such questions demand the briefing of the character of the Reason and the subjectivity that appears with Discardings and if it consummates in the planetary domain of the technique, the place of the end of the philosophy and the instrumentalizao of the language. 1. chology has similar goals. A sprouting of the modern Citizen in cartesian metaphysics When interpreting gnese of the Modern Reason, either in the scope of the philosophy or the limits of the technician-scientific rationality restored by the Scientific Revolution of century XVII, we cannot leave to recognize the originalidade of this new form of rationality that propitiates to the man a new way to think and to say the world. This hegemony of the cartesian pensante citizen starts ahead with the experience of the methodical doubt of tradition, of the preconceptions, the habits and the personal opinion. When fixing as starting point the fact of living the universal and radical doubt, Discardings is established in the conscience of itself while same certainty of itself. Thus, I think I impose myself as the certain affirmation of the conscience in act, of its alive present time while pure fact of conscience. What it emerges of the radicalization of the doubt, its hiperbolizao, is the evidence of Cogito, the certainty for the pensante citizen, that if it exactly affirms as subject conscientious of its object (content) of conscientious thought and of itself. Doravante, Science and the Modern Philosophy know that the authority more does not rest in a principle transcendente God, but in the proper citizen capable to use the Reason methodically route to the always partial certezas.