This paper problematizes Heidegger’s relationship with National Socialism in order to discuss how it stems from certain blindness in his own thinking. By focusing on the Black Notebooks, especially the volume that corresponds to the 1930s, we will analyze Heidegger’s critical position on Being and Time and his new intellectual inclinations, so that the horizon of sense be clarified in which Heidegger takes over factual political positions as rector of the University of Freiburg. So, we attempt to point out that both his philosophical approach and his political stance obey to a single context of problematics: both time and its historical political translation as destiny. From this primacy of time, we will investigate how Heidegger’s philosophy is led to a neglect of the immediate. Finally, this lability will be referred as the reason which explains that Heidegger’s thought, in the Black Notebooks, invalidates itself as philosophy.