Organized Christianity has always represented immortality as a sort of common heritage; but I never could see why spiritual life should not be conditioned on the same terms as all life, i. e., correspondence with environment.
Perhaps one reason for the falling-off of belief in a continuance of conscious existence is to be found in the quality of life that most of us lead. There is not much in it with which, in any kind of reason, one can associate the idea of immortality.
Perhaps the prevalence of pedantry may be largely accounted for by the common error of thinking that, because useful knowledge should be remembered, any kind of knowledge that is at all worth learning should be remembered too.
Someone asked me years ago if it were true that I disliked Jews, and I replied that it was certainly true, not at all because they are Jews but because they are folks, and I don't like folks.
Life has obliged him to remember so much useful knowledge that he has lost not only his history, but his whole original cargo of useless knowledge; history, languages, literatures, the higher mathematics, or what you will - are all gone.
Assuming that man has a distinct spiritual nature, a soul, why should it be thought unnatural that under appropriate conditions of maladjustment, his soul might die before his body does; or that his soul might die without his knowing it?