Time

"...the anticipation of ending makes possible the fixing of ends. The sense of my death is the sense of ending, definitively and irrevocably. It gives me an inward understanding of termination, which combines every sense of goal and every sense of destination. The sense of one's life as a trajectory that casts itself with all its own forces unto its end makes action possible, where life casts some or all of its forces toward some term." -Alphonso Lingis, To Die With Others. 

Alex Siegman