We will in this article to review Kant's postulates of practical reason the author of the critical philosophy. Will realize if we admit as valid and if you follow the ethical route built by Kant. The first part will make a tour of the Transcendental Dialectic of the First critical "in order to check the status of metaphysics at the end of the examination of the question how I know? Then try to criticize the process of moral foundation of Kant and the effect will review the third antinomy and the canon of the Critique of Pure Reason, the Groundwork of the Metaphysics of Morals and the dialectic of the Critique of Practical Reason.Nos ocuparemos en el presente artículo de hacer una revisión kantiana de los postulados de la razón práctica del ...