In Martin Heidegger's Being and Time, he argues that in order to be an authentic self, one must think about death as subjective. First, an authentic self is to be able to reflect and know what is truly important in one's own personal life, to be subjective. Nevertheless, Heidegger believes in his argument by how people see death as an event in life, an event that people see the possibility of happening in the future. Heidegger argues this because people need to see that one's death is only one's own stage in life. Thinking of death will lead the person to realize one's own death is subjective. Heidegger proves this as he writes, "In being-toward-death, Da-sein is related to itself as an eminent potentiality-of-being...'Dying' is levelled down