Sartre’s thinking in L’être et le néant is driven by a conceptual choice that radically breaks with the philosophical spirit of Sein und Zeit and, in the same gesture, problematizes it. This rupture involves three moments. The first moment appears when Sartre transforms Heidegger’s emphasis on ‘being and time’ into ‘being and nothingness’. The second moment occurs when that transformation effectuates a conceptual shift which results in the inversion of the relationship that Heidegger establishes between anxiety and freedom: whereas in (...) Sein und Zeit anxiety is the precondition of freedom, in Sartre freedom becomes the precondition of anxiety. Finally, in the third moment, the absolute primacy of spontaneity in L’être et le néant ultimately serves as the cornerstone for Sartre’s reevaluation of truth, challenging the fundamental concept of ‘Geworfenheit’ in Sein und Zeit. Unlike Heidegger’s view where truth (alètheia) coincides with existence, in L’être et le néant, truth is portrayed as an ongoing struggle: consciousness must consistently fight against it in bad faith or forcefully liberate it from bad faith. Together, these three moments constitute the primary components of Sartre’s originality in relation to Heidegger’s fundamental ontology. (shrink)