The publication of the first volume of the Black notebooks invites us to reconsider some crucial aspects of Heidegger’s books written before 1931. In the first part of this article we focus our attention on fundamental aspects of the life and philosophical evolution of Heidegger, especially in the extent and significance of his break with Catholicism as an element that exasperates his sense of spiritual penury and the need for a fundamental questioning. In the second part, we focus on the Black notebooks from 1931 to 1933 in order to check in what sense Heidegger lives at crucial moments of his life under the influence of what he calls «underground earthquakes». The feeling of loneliness by Heidegger is shown in the fact that, according to ...