Martin Heidegger’s Sein und Zeit presents one of the most striking reflexions on human facticity, i.e. the fact that Dasein fundamentally exists in a world letting Dasein and world be co-extensive. By quoting two central personages in theology, Pascal and Augustine, Heidegger refers to a concept of love that is constitutive for Dasein’s facticity to truth and to knowledge. By investigating the claim that love is as good as absent from Sein und Zeit, the article intends to show that the (...) scanty references to love nevertheless have a central role in Heidegger’s early work and, furthermore, why Heidegger returns to it in his later thinking. Interesting in this regard is the connection between the theological concept of love and Heidegger’s concept of ‘world’. The article places Heidegger’s Destruktion of the metaphysical tradition in the realms of his Dasein analysis focussing on facticity. Taking its methodological cues from Giorgio Agamben and Jacques Derrida, the article shows how the concepts of possibility and impotentiality (Ohnmacht) become essential in Heidegger via his reference to love. Lastly, the article examines to what extent Heidegger’s Sein und Zeit paraphrases the old angelology letting the Dasein concept become its secularisation. (shrink)