Our lives are about development, mutation and the possibility of change; that is almost a definition of what life is: change... If you disable change, if you effectively stop time, if you prevent the possibility of the alteration of an individual's circumstances — and that must include at least the possibility that they alter for the worse — then you don't have life after death; you just have death.
Iain BanksThe History Of The Universe In Three Words CHAPTER ONE Bang! CHAPTER TWO sssss CHAPTER THREE crunch. THE END
Iain Banks...[Changers] were a threat to identity, a challenge to the individualism even of those they were never likely to impersonate. It had nothing to do with souls or physical or spiritual possession; it was, as the Idirans well understood, the behavouristic copying of another which revolted. Individuality, the thing which most humans held more precious than anything else about themselves, was somehow cheapened by the ease with which a Changer could ignore it as a limitation and use it as a disguise.
Iain Banks