In the long crisis of grand philosophy that followed the end of the Hegelian system, Heidegger restored to us the sense of what it means to think in the ‘grand style’. This was not just because of the greatness or depth of his work, which is only now being appreciated in all its splendour. Nor is it because of the acute sensibility which – despite all appearances to the contrary – Heidegger showed in relation to the fundamental problems of our era: the demise of religious conscience, the crisis of traditional values and distrust of a merely instrumental mentality, the end of the absolute on earth and of an epochal horizon of technology. But also and above all because, with a radicalism that nobody after Hegel dared replicate, Heidegger succeeded in rethinking all aspects of Western philosophy, reformulating as a philosophical problem the question of the foundations of the present era and its vital connection with Greek thought. From this perspective, the presence of Aristotle in Heidegger’s thought cannot be circumscribed to the forms of a simple interpretation. Rather it was a generalized presence, which pervaded all of Heidegger’s work and took the form of rapid assimilation and debate aimed at a radical appropriation of Aristotle’s ontology and practical philosophy.