Forwards, always forwards! was the existentialist’s cry, but Heidegger had long since pointed out that no one goes forwards forever. In Being and Time, he depicted Dasein as finding authenticity in ‘Being-towards-death’, that is, in affirming mortality and limitation. He also set out to show that Being itself is not to be found on some eternal, changeless plane: it emerges through Time and through history. Thus, both on the cosmic level and in the lives of each one of us, all things are temporal and finite.