from buddhism I find an interesting concept
the Buddha taught that those who say there is an immortal soul are mistaken, but those who deny one were just as mistaken... which of course leaves most poeple just scratching their heads.....
for me it boils down to this:
I have NEVER known a moment when I did not exist and I will never know such a moment.....
but the me who knows is always existing only in one moment, now.... so NOW is the only moment I ever have to worry about...
is there life after death? the main thing to me is there life BEFORE death? even if I was reincarnated from a prior existance, that does not guarentee that system will continue either.... so now is all I got, now is when I always find myself alive, now is when I have to make any decisions that I need to make, so now is where I have learned to live...and my life has significantly improved since I have stopped trying to live in the future and stopped worrying about changing the past...two things I have never experienced, but only worried too much about.
metaphysically I find that I am a wave upon the ocean and the ocean.... what I am is made of many changing elements and relationships of the one thing which never changes, the overall total universe which never grows nor shrinks in energy... while it may change wildly in size and shape and relationships within it.... so part of me is never the same from moment to moment while all of me is always the same eternally...which I believe answers the buddha's puzzle.