Can you tell me a reason to keep living?
I'll add three to the mix:
1) Einstein's reason:
I can't find where I read this but I'm pretty sure I recall reading it somewhere and that it was Einstein.
(Update: I found the quote I was thinking of:
"A hundred times every day I remind myself that my inner and outer lives are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving." A. Einstein, The World As I See It)