I find this quote from Ursula Le Guin to be both intriguing and comforting. I really like the idea that one can give back to the world that gave each one of us life. It's an intriguing idea, and what's comforting about it is the knowledge that we belong to something much larger than ourselves. Also that we matter to the world, even in death.
I think that when I die, I can breathe back the breath that made me live. I can give back to the world all that I didn't do. All that I might have been and couldn't be. All the choices I didn't make. All the things I lost and spent and wasted. I can give them back to the world. To the lives that haven't been lived yet. That will be my gift back to the world that gave me the life I did live, the love I loved, the breath I breathed.
~Ursula K. Le Guin, from her book The Other Wind