But what is the essence of immortality: only if an infinite extension of life, limb or principal exception of human existence in any form? Do we think about the fact that the latter is equivalent to the absolute exclusion of not only death, but also the birth? Referring to the underlying surface. Each person is unique. It's common knowledge. But the uniqueness of each of us is due to the finiteness of our existence, our mortality nature. The reproduction of the human race strongly unthinkable as a mere repetition of some once and for all given forms - axiomatic to us that it should be permanent (physical and spiritual) of its perfection. And this, in turn, is impossible without a maximum of dissimilarity.