I can't remember ever not being alive. My thoughts and memory store are ever changing. The matter that makes up my body is completely different than, say 7 years ago. Only the D.N.A. code gives it a semblence of continuity. I think of the mind and soul as eternal. It is our doubts in this matter though that drives us to pass on a record of existance within a time frame that surpasses time. To our children's children's children.