"Even many of those who claim to believe in immortality still tell themselves and others that neither side of the question is susceptible of proof. Just what can these hopeful ones believe that the word "proof" involves? The evidence against the persistence of personal consciousness is as strong as the the evidence for gravitation, and much more obvious. It is as convincing and unassailable as the proof of the destruction of wood or coal by fire. If it is not certain that death ends personal identity and memory, then almost nothing that man accepts as true is susceptible as proof." [Clarence Darrow, "The Myth of Immortality"]