This debate is surely influenced by the importance, that we, on this forum and elsewhere, attribute to individual consciousness. Understandable, for the reasons of a widespread fear of one's own death, and the unknown. We know we are made of the same stuff of the universe, and the universe contains the essential ingredients in at least one part of itself, that created through the laws of physics an evolved form of organic life that ponders on its own existence. It can be argued that we, human life, is a common consciousness of the universe, and that it is the more relevant description rather than apportioning it to individual humans. If we accept that, then non-existence before and after death, ceases to become important, rather like Twain's quote. More importance perhaps should be given to humanity as an ever growing wave of mass consciousness, dynamically moving along a timeline of existence, where that total of reflexive thought is part of an inevitable development in the evolution of our universe.