The secret of life is more life. - David Zindell

For it is only in accepting death that one can truly live, and for the human animal, death has always been the great black beast from the abyss to be dreaded or defeated or avoided or hated - but never looked upon clearly face to face.

But it is the nature of life that no emotion is meant to last forever...

Do you want to know the secret of life? Bardo will tell you the secret of life: it's not the amount of time we have, despite what I've just said. No it's not quantity and it's not even quality. It's variety.